10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 10-Q

(Mark one)

þ        QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934. 

For the quarterly period ended March 31, 2018.

¨       TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934. 

For the transition period from _____________________ to _____________________.

Commission file number 0-4604

CINCINNATI FINANCIAL CORPORATION

(Exact name of registrant as specified in its charter)

Ohio	31-0746871
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification No.)
6200 S. Gilmore Road, Fairfield, Ohio	45014-5141
(Address of principal executive offices)	(Zip code)

Registrant’s telephone number, including area code: (513) 870-2000

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. 

þYes ¨ No

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate website, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).

þYes ¨ No

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a nonaccelerated filer, a smaller reporting company or an emerging growth company. See definition of “large accelerated filer,” “accelerated filer,” “smaller reporting company" and "emerging growth company" in Rule 12b-2 of the Exchange Act.

þ Large accelerated filer ¨ Accelerated filer ¨ Nonaccelerated filer ¨ Smaller reporting company

¨ Emerging growth company

(Do not check if a smaller reporting company)

¨ If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act):

¨Yes þ No

As of April 20, 2018, there were 164,145,978 shares of common stock outstanding.

CINCINNATI FINANCIAL CORPORATION AND SUBSIDIARIES

FORM 10-Q FOR THE QUARTER ENDED March 31, 2018

TABLE OF CONTENTS

Part I – Financial Information	3
Item 1. Financial Statements (unaudited)	3
Condensed Consolidated Balance Sheets	3
Condensed Consolidated Statements of Income	4
Condensed Consolidated Statements of Comprehensive Income	5
Condensed Consolidated Statements of Shareholders’ Equity	6
Condensed Consolidated Statements of Cash Flows	7
Notes to Condensed Consolidated Financial Statements (unaudited)	8
Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations	29
Safe Harbor Statement	29
Corporate Financial Highlights	31
Financial Results	41
Liquidity and Capital Resources	56
Other Matters	60
Item 3. Quantitative and Qualitative Disclosures about Market Risk	60
Item 4. Controls and Procedures	67
Part II – Other Information	68
Item 1. Legal Proceedings	68
Item 1A. Risk Factors	68
Item 2. Unregistered Sales of Equity Securities and Use of Proceeds	68
Item 6. Exhibits	69

Cincinnati Financial Corporation First-Quarter 2018 10-Q

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Part I – Financial Information

Item 1.    Financial Statements (unaudited)

Cincinnati Financial Corporation and Subsidiaries

Condensed Consolidated Balance Sheets

(Dollars in millions, except per share data)	March 31,			December 31,
	2018			2017
Assets
Investments
Fixed maturities, at fair value (amortized cost: 2018—$10,364; 2017—$10,314)	$	10,528		$	10,699
Equity securities, at fair value (cost: 2017—$3,094)	6,086			6,249
Other invested assets	107			103
Total investments	16,721			17,051
Cash and cash equivalents	604			657
Investment income receivable	124			134
Finance receivable	61			61
Premiums receivable	1,626			1,589
Reinsurance recoverable	423			432
Prepaid reinsurance premiums	39			42
Deferred policy acquisition costs	691			670
Land, building and equipment, net, for company use (accumulated depreciation:    2018—$259; 2017—$253)	186			185
Other assets	192			216
Separate accounts	803			806
Total assets	$	21,470		$	21,843
Liabilities
Insurance reserves
Loss and loss expense reserves	$	5,345		$	5,273
Life policy and investment contract reserves	2,740			2,729
Unearned premiums	2,459			2,404
Other liabilities	672			792
Deferred income tax	652			745
Note payable	24			24
Long-term debt and capital lease obligations	829			827
Separate accounts	803			806
Total liabilities	13,524			13,600
Commitments and contingent liabilities (Note 12)
Shareholders' Equity
Common stock, par value—$2 per share; (authorized: 2018 and 2017—500 million    shares; issued: 2018 and 2017—198.3 million shares)	397			397
Paid-in capital	1,258			1,265
Retained earnings	7,565			5,180
Accumulated other comprehensive income	115			2,788
Treasury stock at cost (2018—34.2 million shares and 2017—34.4 million shares)	(1,389		)	(1,387		)
Total shareholders' equity	7,946			8,243
Total liabilities and shareholders' equity	$	21,470		$	21,843

 Accompanying Notes are an integral part of these Condensed Consolidated Financial Statements.

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Cincinnati Financial Corporation and Subsidiaries

Condensed Consolidated Statements of Income

(Dollars in millions, except per share data)	Three months ended March 31,
	2018			2017
Revenues
Earned premiums	$	1,260		$	1,208
Investment income, net of expenses	150			149
Investment gains and losses, net	(191		)	160
Fee revenues	4			5
Other revenues	1			1
Total revenues	1,224			1,523
Benefits and Expenses
Insurance losses and contract holders' benefits	854			853
Underwriting, acquisition and insurance expenses	403			377
Interest expense	13			13
Other operating expenses	4			4
Total benefits and expenses	1,274			1,247
Income (Loss) Before Income Taxes	(50		)	276
Provision (Benefit) for Income Taxes
Current	28			40
Deferred	(47		)	35
Total provision (benefit) for income taxes	(19		)	75
Net Income (Loss)	$	(31	)	$	201
Per Common Share
Net income (loss)—basic	$	(0.19	)	$	1.22
Net income (loss)—diluted	(0.19		)	1.21

Accompanying Notes are an integral part of these Condensed Consolidated Financial Statements.

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Cincinnati Financial Corporation and Subsidiaries

Condensed Consolidated Statements of Comprehensive Income

(Dollars in millions)	Three months ended March 31,
	2018			2017
Net Income (Loss)	$	(31	)	$	201
Other Comprehensive Income (Loss)
Change in unrealized gains on investments, net of tax (benefit) of ($46) and $46, respectively	(175		)	85
Amortization of pension actuarial loss and prior service cost, net of tax of $0 and $0, respectively	—			1
Change in life deferred acquisition costs, life policy reserves and other, net of tax of $1 and $1, respectively	5			1
Other comprehensive income (loss)	(170		)	87
Comprehensive Income (Loss)	$	(201	)	$	288

Accompanying Notes are an integral part of these Condensed Consolidated Financial Statements.

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Cincinnati Financial Corporation and Subsidiaries

Condensed Consolidated Statements of Shareholders' Equity

(Dollars in millions)	Three months ended March 31,
	2018			2017
Common Stock
Beginning of year	$	397		$	397
Share-based awards	—			—
End of period	397			397
Paid-In Capital
Beginning of year	1,265			1,252
Share-based awards	(17		)	(18		)
Share-based compensation	9			8
Other	1			1
End of period	1,258			1,243
Retained Earnings
Beginning of year	5,180			5,037
Cumulative effect of change in accounting for equity securities as of January 1, 2018	2,503			—
Adjusted beginning of year	7,683			5,037
Net income (loss)	(31		)	201
Dividends declared	(87		)	(82		)
End of period	7,565			5,156
Accumulated Other Comprehensive Income
Beginning of year	2,788			1,693
Cumulative effect of change in accounting for equity securities as of January 1, 2018	(2,503		)	—
Adjusted beginning of year	285			1,693
Other comprehensive income (loss)	(170		)	87
End of period	115			1,780
Treasury Stock
Beginning of year	(1,387		)	(1,319		)
Share-based awards	14			17
Shares acquired - share repurchase authorization	(15		)	(15		)
Shares acquired - share-based compensation plans	(2		)	(4		)
Other	1			1
End of period	(1,389		)	(1,320		)
Total Shareholders' Equity	$	7,946		$	7,256
(In millions)
Common Stock - Shares Outstanding
Beginning of year	163.9			164.4
Share-based awards	0.4			0.5
Shares acquired - share repurchase authorization	(0.2		)	(0.2		)
Shares acquired - share-based compensation plans	—			(0.1		)
Other	—			—
End of period	164.1			164.6

Accompanying Notes are an integral part of these Condensed Consolidated Financial Statements.

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Cincinnati Financial Corporation and Subsidiaries

Condensed Consolidated Statements of Cash Flows

(Dollars in millions)	Three months ended March 31,
	2018			2017
Cash Flows From Operating Activities
Net income (loss)	$	(31	)	$	201
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	18			14
Investment gains and losses, net	191			(160		)
Share-based compensation	9			8
Interest credited to contract holders'	11			13
Deferred income tax expense	(47		)	35
Changes in:
Investment income receivable	10			11
Premiums and reinsurance receivable	(26		)	(44		)
Deferred policy acquisition costs	(10		)	(25		)
Other assets	(8		)	(5		)
Loss and loss expense reserves	72			92
Life policy and investment contract reserves	21			25
Unearned premiums	55			70
Other liabilities	(137		)	(139		)
Current income tax receivable/payable	26			40
Net cash provided by operating activities	154			136
Cash Flows From Investing Activities
Sale of fixed maturities	5			12
Call or maturity of fixed maturities	393			249
Sale of equity securities	104			216
Purchase of fixed maturities	(438		)	(403		)
Purchase of equity securities	(110		)	(313		)
Investment in finance receivables	(6		)	(5		)
Collection of finance receivables	6			6
Investment in buildings and equipment	(3		)	(2		)
Change in other invested assets, net	(5		)	(6		)
Net cash used in investing activities	(54		)	(246		)
Cash Flows From Financing Activities
Payment of cash dividends to shareholders	(80		)	(77		)
Shares acquired - share repurchase authorization	(15		)	(15		)
Payments of note payable	—			(3		)
Proceeds from stock options exercised	4			6
Contract holders' funds deposited	21			23
Contract holders' funds withdrawn	(46		)	(43		)
Other	(37		)	(15		)
Net cash used in financing activities	(153		)	(124		)
Net change in cash and cash equivalents	(53		)	(234		)
Cash and cash equivalents at beginning of year	657			777
Cash and cash equivalents at end of period	$	604		$	543
Supplemental Disclosures of Cash Flow Information:
Interest paid	$	—		$	—
Income taxes paid	—			—
Noncash Activities
Conversion of securities	$	3		$	4
Equipment acquired under capital lease obligations	5			3
Cashless exercise of stock options	2			4
Other assets and other liabilities	30			73

 Accompanying Notes are an integral part of these Condensed Consolidated Financial Statements.

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NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED)

NOTE 1 — Accounting Policies

The condensed consolidated financial statements include the accounts of Cincinnati Financial Corporation and its consolidated subsidiaries, each of which is wholly owned. These statements are presented in conformity with accounting principles generally accepted in the United States of America (GAAP). All intercompany balances and transactions have been eliminated in consolidation.

The preparation of financial statements in conformity with GAAP requires us to make estimates and assumptions that affect amounts reported in the financial statements and accompanying notes. Our actual results could differ from those estimates. Certain financial information that is normally included in annual financial statements prepared in accordance with GAAP, but that is not required for interim reporting purposes, has been condensed or omitted.

Our March 31, 2018, condensed consolidated financial statements are unaudited. We believe that we have made all adjustments, consisting only of normal recurring accruals, that are necessary for fair presentation. These condensed consolidated financial statements should be read in conjunction with our consolidated financial statements included in our 2017 Annual Report on Form 10-K. The results of operations for interim periods do not necessarily indicate results to be expected for the full year.

Adopted Accounting Updates

ASU 2014-09 Revenue from Contracts with Customers

In May 2014, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) 2014-09, Revenue from Contracts with Customers. ASU 2014-09 requires an entity to recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods and services. Insurance contracts do not fall within the scope of this ASU. The effective date of ASU 2014-09 was for interim and annual reporting periods beginning after December 15, 2017. The company adopted this ASU effective January 1, 2018 and it did not have a material impact on the company's consolidated financial position, cash flows or results of operations.

ASU 2016-01, Financial Instruments - Overall (Subtopic 825-10) - Recognition and Measurement of Financial Assets and Financial Liabilities

In January 2016, the FASB issued ASU 2016-01, Financial Instruments - Overall (Subtopic 825-10) - Recognition and Measurement of Financial Assets and Financial Liabilities. ASU 2016-01 revised the accounting related to the classification and measurement of investments in equity securities and the presentation of certain fair value changes for financial liabilities measured at fair value. The effective date of ASU 2016-01 was for interim and annual reporting periods beginning after December 15, 2017. The company adopted this ASU on January 1, 2018, and applied it prospectively without prior period amounts restated. As a result of the adoption, $2.503 billion of after-tax unrealized gains on equity securities was reclassified on January 1, 2018, from accumulated other comprehensive income to retained earnings. Results of operations were impacted as changes in fair value of equity securities are now reported in net income (loss) instead of reported in other comprehensive income (loss). As a result of the adoption of this ASU, the first quarter 2018 net investment loss of $191 million in the condensed consolidated statements of income included $198 million from the fair value change of equity securities.

ASU 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments

In August 2016, the FASB issued ASU 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments. ASU 2016-15 addresses eight specific cash flow issues with the objective of reducing the existing diversity in practice. The effective date of ASU 2016-15 is for interim and annual reporting periods beginning after December 15, 2017. The company adopted this ASU effective January 1, 2018, and it did not have a material impact on our company's consolidated financial position, cash flows or results of operations.

ASU 2017-07, Compensation - Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost

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In March 2017, the FASB issued ASU 2017-07, Compensation - Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Postretirement Benefit Costs. ASU 2017-07 provides guidance on how to present the components of net periodic benefit costs in the income statement for pension plans and other post-retirement benefit plans and allows only the service cost component of net benefit cost to be eligible for capitalization when applicable. The effective date of ASU 2017-07 is for interim and annual reporting periods beginning after December 15, 2017. The company adopted this ASU effective January 1, 2018 and disclosed the line items used in the statements of income to present the service and non-service components of net periodic benefit costs in Note 11, Employee Retirement Benefits, to these consolidated financial statements. The adoption did not have a material impact on our company's consolidated financial position, cash flows or results of operations.

ASU 2017-09, Compensation - Stock Compensation (Topic 718): Scope of Modification Accounting

In May 2017, the FASB issued ASU 2017-09, Compensation - Stock Compensation (Topic 718): Scope of Modification Accounting. ASU 2017-09 clarifies when to account for a change to the terms or conditions of a share based payment award as a modification. Under the new guidance, modification accounting is required only if the fair value, the vesting conditions, or the classification of the award (as equity or liability) changes as a result of the change in terms or conditions. The effective date of ASU 2017-09 was for interim and annual reporting periods, beginning after December 15, 2017, and was applied prospectively. The company adopted this ASU effective January 1, 2018, and it did not have a material impact on our company's consolidated financial position, cash flows or results of operations.

Pending Accounting Updates

ASU 2016-02, Leases (Topic 842)

In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842). The main provision of ASU 2016-02 requires the recognition of lease assets and lease liabilities by lessees for those leases classified as operating leases under previous GAAP. The effective date of ASU 2016-02 is for interim and annual reporting periods beginning after December 15, 2018. The ASU has not yet been adopted; however, it is not expected to have a material impact on our company’s consolidated financial position, cash flows or results of operations.

ASU 2016-13, Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments

In June 2016, the FASB issued ASU 2016-13, Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments. ASU 2016-13 amends previous guidance on the impairment of financial instruments by adding an impairment model that allows an entity to recognize expected credit losses as an allowance rather than impairing as they are incurred. The new guidance is intended to reduce complexity of credit impairment models and result in a more timely recognition of expected credit losses. The effective date of ASU 2016-13 is for interim and annual reporting periods beginning after December 15, 2019. The ASU has not yet been adopted. Management is currently evaluating the impact on our company's consolidated financial position, cash flows or results of operations.

ASU 2017-08, Receivables - Nonrefundable Fees and Other Costs (Subtopic 310-20): Premium Amortization on Purchased Callable Debt Securities

In March 2017, the FASB issued ASU 2017-08, Receivables - Nonrefundable Fees and Other Costs (Subtopic 310-20): Premium Amortization on Purchased Callable Debt Securities. ASU 2017-08 amends guidance on the amortization period of premiums on certain purchased callable debt securities. The amendments shorten the amortization period of premiums on certain purchased callable debt securities to the earliest call date. The amendments should be applied on a modified retrospective basis through a cumulative-effect adjustment to beginning retained earnings. The effective date of ASU 2017-08 is for interim and annual reporting periods beginning after December 15, 2018. The ASU has not yet been adopted; however, it is not expected to have a material impact on our company's consolidated financial position, cash flows or results of operations.

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NOTE 2 – Investments

In the first quarter of 2018, we adopted ASU 2016-01, which resulted in changes in the fair value of equity securities still held at March 31, 2018, being reported in net income (loss) instead of being reported in other comprehensive income (loss). See Note 1, Accounting Policies, for additional discussion.

The following table provides cost or amortized cost, gross unrealized gains, gross unrealized losses and fair value for our fixed-maturity and equity securities:

(Dollars in millions)	Cost or amortized cost		Gross unrealized				Fair value
At March 31, 2018			gains		losses
Fixed maturity securities:
Corporate	$	5,452	$	155	$	35	$	5,572
States, municipalities and political subdivisions	4,304		85		35		4,354
Commercial mortgage-backed	285		3		2		286
Government-sponsored enterprises	277		—		6		271
United States government	36		—		1		35
Foreign government	10		—		—		10
Total	10,364		243		79		10,528
At December 31, 2017
Fixed maturity securities:
Corporate	$	5,420	$	246	$	13	$	5,653
States, municipalities and political subdivisions	4,316		155		6		4,465
Commercial mortgage-backed	280		7		1		286
Government-sponsored enterprises	257		1		4		254
United States government	31		—		—		31
Foreign government	10		—		—		10
Subtotal	10,314		409		24		10,699
Equity securities:
Common equities	2,918		3,135		14		6,039
Nonredeemable preferred equities	176		34		—		210
Subtotal	3,094		3,169		14		6,249
Total	$	13,408	$	3,578	$	38	$	16,948

The net unrealized investment gains in our fixed-maturity portfolio at March 31, 2018, are primarily the result of the continued low interest rate environment that increased the fair value of our fixed-maturity portfolio. Our commercial mortgage-backed securities had an average rating of Aa1/AA at March 31, 2018, and December 31, 2017.

At March 31, 2018, JP Morgan Chase & Co. (NYSE:JPM) was our largest single equity holding with a fair value of $248 million, which was 4.2 percent of our publicly traded common equities portfolio and 1.5 percent of the total investment portfolio.

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The table below provides fair values and gross unrealized losses by investment category and by the duration of the securities’ continuous unrealized loss positions:

(Dollars in millions)	Less than 12 months				12 months or more				Total
At March 31, 2018	Fair value		Unrealized losses		Fair value		Unrealized losses		Fair value		Unrealized losses
Fixed maturity securities:
Corporate	$	1,002	$	20	$	253	$	15	$	1,255	$	35
States, municipalities and political subdivisions	1,052		21		256		14		1,308		35
Commercial mortgage-backed securities	81		1		35		1		116		2
Government-sponsored enterprises	131		2		123		4		254		6
Foreign government	10		—		—		—		10		—
United States government	24		1		11		—		35		1
Total	$	2,300	$	45	$	678	$	34	$	2,978	$	79
At December 31, 2017
Fixed maturity securities:
Corporate	$	330	$	4	$	252	$	9	$	582	$	13
States, municipalities and political subdivisions	88		1		264		5		352		6
Commercial mortgage-backed	33		—		36		1		69		1
Government-sponsored enterprises	96		1		124		3		220		4
Foreign government	10		—		—		—		10		—
United States government	23		—		6		—		29		—
Subtotal	580		6		682		18		1,262		24
Equity securities:
Common equities	229		14		—		—		229		14
Subtotal	229		14		—		—		229		14
Total	$	809	$	20	$	682	$	18	$	1,491	$	38

Contractual maturity dates for fixed-maturity investments were:

(Dollars in millions)	Amortized cost		Fair value		% of fair value
At March 31, 2018
Maturity dates:
Due in one year or less	$	449	$	457	4.4	%
Due after one year through five years	2,714		2,768		26.3
Due after five years through ten years	3,986		4,046		38.4
Due after ten years	3,215		3,257		30.9
Total	$	10,364	$	10,528	100.0	%

Actual maturities may differ from contractual maturities when there is a right to call or prepay obligations with or without call or prepayment penalties.

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The following table provides investment income and investment gains and losses, net:

(Dollars in millions)	Three months ended March 31,
	2018			2017
Investment income:
Interest	$	110		$	111
Dividends	42			39
Other	1			1
Total	153			151
Less investment expenses	3			2
Total	$	150		$	149
Investment gains and losses, net:
Equity securities:
Investment gains and losses on securities sold, net	$	3		$	—
Unrealized gains and losses on securities still held, net	(198		)	—
Gross realized gains	—			153
Gross realized losses	—			(4		)
Subtotal	(195		)	149
Fixed maturities:
Gross realized gains	4			10
Gross realized losses	—			—
Subtotal	4			10
Other	—			1
Total	$	(191	)	$	160

During the three months ended March 31, 2018, there were no fixed-maturity securities other-than-temporarily impaired. During the three months ended March 31, 2017, there were no equity securities and no fixed-maturity securities other-than-temporarily impaired. There were no credit losses on fixed-maturity securities for which a portion of other-than-temporary impairment (OTTI) has been recognized in other comprehensive income (loss) for the three months ended March 31, 2018 and 2017.

At March 31, 2018, 250 fixed-maturity investments with a total unrealized loss of $34 million had been in an unrealized loss position for 12 months or more. Of that total, one fixed-maturity investment had a fair value below 70 percent of amortized cost. At December 31, 2017, 249 fixed-maturity investments with a total unrealized loss of $18 million had been in an unrealized loss position for 12 months or more. Of that total, no fixed-maturity investments had fair values below 70 percent of amortized cost. There were no equity security investments in an unrealized loss position for 12 months or more as of December 31, 2017.

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NOTE 3 – Fair Value Measurements

In accordance with accounting guidance for fair value measurements and disclosures, we categorized our financial instruments, based on the priority of the observable and market-based data for the valuation technique used, into a three-level fair value hierarchy. The fair value hierarchy gives the highest priority to quoted prices with readily available independent data in active markets for identical assets or liabilities (Level 1) and the lowest priority to unobservable market inputs (Level 3). When various inputs for measurement fall within different levels of the fair value hierarchy, the lowest observable input that has a significant impact on fair value measurement is used. Our valuation techniques have not changed from those used at December 31, 2017, and ultimately management determines fair value. See our 2017 Annual Report on Form 10-K, Item 8, Note 3, Fair Value Measurements, Page 132, for information on characteristics and valuation techniques used in determining fair value.

Fair Value Disclosures for Assets

The following tables illustrate the fair value hierarchy for those assets measured at fair value on a recurring basis at March 31, 2018, and December 31, 2017. We do not have any liabilities carried at fair value. There were no transfers between Level 1 and Level 2.

(Dollars in millions)	Quoted prices in active markets for identical assets (Level 1)		Significant other observable inputs (Level 2)		Significant unobservable inputs (Level 3)		Total
At March 31, 2018
Fixed maturities, available for sale:
Corporate	$	—	$	5,571	$	1	$	5,572
States, municipalities and political subdivisions	—		4,350		4		4,354
Commercial mortgage-backed	—		286		—		286
Government-sponsored enterprises	—		271		—		271
United States government	35		—		—		35
Foreign government	—		10		—		10
Subtotal	35		10,488		5		10,528
Common equities	5,893		—		—		5,893
Nonredeemable preferred equities	—		193		—		193
Separate accounts taxable fixed maturities	—		793		—		793
Top Hat savings plan mutual funds and common equity (included in Other assets)	34		—		—		34
Total	$	5,962	$	11,474	$	5	$	17,441
At December 31, 2017
Fixed maturities, available for sale:
Corporate	$	—	$	5,652	$	1	$	5,653
States, municipalities and political subdivisions	—		4,460		5		4,465
Commercial mortgage-backed	—		286		—		286
Government-sponsored enterprises	—		254		—		254
United States government	31		—		—		31
Foreign government	—		10		—		10
Subtotal	31		10,662		6		10,699
Common equities, available for sale	6,039		—		—		6,039
Nonredeemable preferred equities, available for sale	—		210		—		210
Separate accounts taxable fixed maturities	—		795		—		795
Top Hat savings plan mutual funds and common   equity (included in Other assets)	31		—		—		31
Total	$	6,101	$	11,667	$	6	$	17,774

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Each financial instrument that was deemed to have significant unobservable inputs when determining valuation is identified in the following tables by security type with a summary of changes in fair value as of March 31, 2018. Total Level 3 assets continue to be less than 1 percent of financial assets measured at fair value in the condensed consolidated balance sheets. Assets presented in the table below were valued based primarily on broker/dealer quotes for which there is a lack of transparency as to inputs used to develop the valuations. Transfers out of Level 3 included situations where a broker quote was used without observable inputs or data that could be corroborated by our pricing vendors in the prior period and significant other observable inputs were identified in the current period. The quantitative detail of these unobservable inputs is neither provided nor reasonably available to us.

The following table provides the change in Level 3 assets for the three months ended March 31:

(Dollars in millions)	Asset fair value measurements using significant unobservable inputs
		Corporate fixed maturities			States, municipalities and political subdivisions fixed maturities			Total
Beginning balance, January 1, 2018		$	1		$	5		$	6
Total gains or losses (realized/unrealized):
Included in net income (loss)		—			—			—
Included in other comprehensive income (loss)		—			(1		)	(1		)
Purchases		—			—			—
Sales		—			—			—
Transfers into Level 3		—			—			—
Transfers out of Level 3		—			—			—
Ending balance, March 31, 2018		$	1		$	4		$	5
Beginning balance, January 1, 2017		$	78		$	—		$	78
Total gains or losses (realized/unrealized):
Included in net income		—			—			—
Included in other comprehensive income		—			—			—
Purchases		—			—			—
Sales		—			—			—
Transfers into Level 3		—			—			—
Transfers out of Level 3		(77		)	—			(77		)
Ending balance, March 31, 2017		$	1		$	—		$	1

With the exception of the above table, additional disclosures for the Level 3 category are not material and therefore not provided.

Fair Value Disclosures for Assets and Liabilities Not Carried at Fair Value

The disclosures below are presented to provide information about the effects of current market conditions on financial instruments that are not reported at fair value in our condensed consolidated financial statements.

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This table summarizes the book value and principal amounts of our long-term debt:

(Dollars in millions)				Book value				Principal amount
Interest rate		Year of  issue		March 31,		December 31,		March 31,		December 31,
				2018		2017		2018		2017
6.900	%	1998	Senior debentures, due 2028	$	26	$	26	$	28	$	28
6.920	%	2005	Senior debentures, due 2028	391		391		391		391
6.125	%	2004	Senior notes, due 2034	370		370		374		374
			Total	$	787	$	787	$	793	$	793

The following table shows fair values of our note payable and long-term debt:

(Dollars in millions)	Quoted prices in active markets for identical assets (Level 1)		Significant other observable inputs (Level 2)		Significant unobservable inputs (Level 3)		Total
At March 31, 2018
Note payable	$	—	$	24	$	—	$	24
6.900% senior debentures, due 2028	—		33		—		33
6.920% senior debentures, due 2028	—		490		—		490
6.125% senior notes, due 2034	—		464		—		464
Total	$	—	$	1,011	$	—	$	1,011
At December 31, 2017
Note payable	$	—	$	24	$	—	$	24
6.900% senior debentures, due 2028	—		34		—		34
6.920% senior debentures, due 2028	—		505		—		505
6.125% senior notes, due 2034	—		477		—		477
Total	$	—	$	1,040	$	—	$	1,040

The following table shows the fair value of our life policy loans included in other invested assets:

(Dollars in millions)	Quoted prices in active markets for identical assets (Level 1)		Significant other observable inputs (Level 2)		Significant unobservable inputs (Level 3)		Total
At March 31, 2018
Life policy loans	$	—	$	—	$	40	$	40
At December 31, 2017
Life policy loans	$	—	$	—	$	41	$	41

Outstanding principal and interest for these life policy loans totaled $31 million at March 31, 2018, and December 31, 2017.

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The following table shows fair values of our deferred annuities and structured settlements included in life policy and investment contract reserves:

(Dollars in millions)	Quoted prices in active markets for identical assets (Level 1)		Significant other observable inputs (Level 2)		Significant unobservable inputs (Level 3)		Total
At March 31, 2018
Deferred annuities	$	—	$	—	$	788	$	788
Structured settlements	—		200		—		200
Total	$	—	$	200	$	788	$	988
At December 31, 2017
Deferred annuities	$	—	$	—	$	834	$	834
Structured settlements	—		210		—		210
Total	$	—	$	210	$	834	$	1,044

Recorded reserves for the deferred annuities were $821 million and $835 million at March 31, 2018, and December 31, 2017, respectively. Recorded reserves for the structured settlements were $161 million at March 31, 2018, and December 31, 2017.

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NOTE 4 – Property Casualty Loss and Loss Expenses

This table summarizes activity for our consolidated property casualty loss and loss expense reserves:

(Dollars in millions)	Three months ended March 31,
	2018			2017
Gross loss and loss expense reserves, beginning of period	$	5,219		$	5,035
Less reinsurance recoverable	187			298
Net loss and loss expense reserves, beginning of period	5,032			4,737
Net incurred loss and loss expenses related to:
Current accident year	839			826
Prior accident years	(48		)	(38		)
Total incurred	791			788
Net paid loss and loss expenses related to:
Current accident year	195			185
Prior accident years	519			509
Total paid	714			694
Net loss and loss expense reserves, end of period	5,109			4,831
Plus reinsurance recoverable	184			297
Gross loss and loss expense reserves, end of period	$	5,293		$	5,128

We use actuarial methods, models and judgment to estimate, as of a financial statement date, the property casualty loss and loss expense reserves required to pay for and settle all outstanding insured claims, including incurred but not reported (IBNR) claims, as of that date. The actuarial estimate is subject to review and adjustment by an inter-departmental committee that includes actuarial, claims, underwriting, loss prevention and accounting management. This committee is familiar with relevant company and industry business, claims and underwriting trends, as well as general economic and legal trends that could affect future loss and loss expense payments. The amount we will actually have to pay for claims can be highly uncertain. This uncertainty, together with the size of our reserves, makes the loss and loss expense reserves our most significant estimate. The reserve for loss and loss expenses in the condensed consolidated balance sheets also included $52 million at March 31, 2018, and

$49 million at March 31, 2017, for certain life and health loss and loss expense reserves.

For the three months endedMarch 31, 2018, we experienced $48 million of favorable development on prior accident years, including $35 million of favorable development in commercial lines, $1 million of favorable development in personal lines, $10 million of favorable development in excess and surplus lines and $2 million of favorable development in our reinsurance assumed operations. This included $7 million from favorable development of catastrophe losses for the three months endedMarch 31, 2018. For the three months endedMarch 31, 2018, we recognized favorable reserve development of $21 million for the commercial property line, $13 million for the workers' compensation line, $2 million for the commercial auto line and $4 million for the other commercial lines due to reduced uncertainty of prior accident year loss and loss adjustment expense for these lines. For the three months endedMarch 31, 2018, we recognized unfavorable reserve development of $5 million for the commercial casualty line. The unfavorable reserve development for commercial casualty was primarily due to an increase in case reserves for accident year 2017.

For the three months endedMarch 31, 2017, we experienced $38 million of favorable development on prior accident years, including $11 million of favorable development in commercial lines, $10 million of favorable development in personal lines, $13 million of favorable development in excess and surplus lines and $4 million of favorable development in our reinsurance assumed operations. This included $11 million from favorable development of catastrophe losses for the three months endedMarch 31, 2017. For the three months endedMarch 31, 2017, we recognized favorable reserve development of $18 million for the workers' compensation line, $10 million for the commercial property line and $8 million for the other commercial lines due to reduced uncertainty of prior accident year loss and loss adjustment expenses for these lines. For the three months ended March 31, 2017, we recognized unfavorable reserve development of $15 million for the commercial casualty line and $10 million for the commercial auto line. The unfavorable reserve development for commercial casualty reflected higher

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than usual large loss activity. Commercial auto developed unfavorably due to higher loss cost effects in recent accident years, resulting in an increase of our reserve estimate for claims that have not yet been settled.

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NOTE 5 – Life Policy and Investment Contract Reserves

We establish the reserves for traditional life insurance policies based on expected expenses, mortality, morbidity, withdrawal rates, timing of claim presentation and investment yields, including a provision for uncertainty. Once these assumptions are established, they generally are maintained throughout the lives of the contracts. We use both our own experience and industry experience, adjusted for historical trends, in arriving at our assumptions for expected mortality, morbidity and withdrawal rates as well as for expected expenses. We base our assumptions for expected investment income on our own experience adjusted for current economic conditions.

We establish reserves for the company’s deferred annuity, universal life and structured settlement policies equal to the cumulative account balances, which include premium deposits plus credited interest less charges and withdrawals. Some of our universal life policies contain no-lapse guarantee provisions. For these policies, we establish a reserve in addition to the account balance, based on expected no-lapse guarantee benefits and expected policy assessments.

This table summarizes our life policy and investment contract reserves:

(Dollars in millions)	March 31, 2018		December 31, 2017
Life policy reserves:
Ordinary/traditional life	$	1,098	$	1,080
Other	47		47
Subtotal	1,145		1,127
Investment contract reserves:
Deferred annuities	821		835
Universal life	607		601
Structured settlements	161		160
Other	6		6
Subtotal	1,595		1,602
Total life policy and investment contract reserves	$	2,740	$	2,729

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NOTE 6 – Deferred Policy Acquisition Costs

Expenses directly related to successfully acquired insurance policies – primarily commissions, premium taxes and underwriting costs – are deferred and amortized over the terms of the policies. We update our acquisition cost assumptions periodically to reflect actual experience, and we evaluate the costs for recoverability. The table below shows the deferred policy acquisition costs and asset reconciliation.

(Dollars in millions)	Three months ended March 31,
	2018			2017
Property casualty:
Deferred policy acquisition costs asset, beginning of period	$	438		$	408
Capitalized deferred policy acquisition costs	232			226
Amortized deferred policy acquisition costs	(224		)	(206		)
Deferred policy acquisition costs asset, end of period	$	446		$	428
Life:
Deferred policy acquisition costs asset, beginning of period	$	232		$	229
Capitalized deferred policy acquisition costs	13			13
Amortized deferred policy acquisition costs	(10		)	(8		)
Amortized shadow deferred policy acquisition costs	10			(2		)
Deferred policy acquisition costs asset, end of period	$	245		$	232
Consolidated:
Deferred policy acquisition costs asset, beginning of period	$	670		$	637
Capitalized deferred policy acquisition costs	245			239
Amortized deferred policy acquisition costs	(234		)	(214		)
Amortized shadow deferred policy acquisition costs	10			(2		)
Deferred policy acquisition costs asset, end of period	$	691		$	660

No premium deficiencies were recorded in the condensed consolidated statements of income, as the sum of the anticipated loss and loss expenses, policyholder dividends and unamortized deferred acquisition expenses did not exceed the related unearned premiums and anticipated investment income.

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NOTE 7 – Accumulated Other Comprehensive Income

Accumulated other comprehensive income (AOCI) includes changes in unrealized gains and losses on investments, changes in pension obligations and changes in life deferred acquisition costs, life policy reserves and other as follows:

(Dollars in millions)	Three months ended March 31,
	2018									2017
	Before tax			Income tax			Net			Before tax			Income tax			Net
Investments:
AOCI, beginning of period	$	3,540		$	733		$	2,807		$	2,625		$	908		$	1,717
Cumulative effect of change in accounting for equity securities as of January 1, 2018	(3,155		)	(652		)	(2,503		)	—			—			—
Adjusted AOCI, beginning of period	385			81			304			2,625			908			1,717
OCI before investment gains recognized in net income	(217		)	(45		)	(172		)	290			102			188
Investment gains recognized in net income	(4		)	(1		)	(3		)	(159		)	(56		)	(103		)
OCI	(221		)	(46		)	(175		)	131			46			85
AOCI, end of period	$	164		$	35		$	129		$	2,756		$	954		$	1,802
Pension obligations:
AOCI, beginning of period	$	(12	)	$	(1	)	$	(11	)	$	(26	)	$	(8	)	$	(18	)
OCI excluding amortization recognized in net income	—			—			—			—			—			—
Amortization recognized in net income	—			—			—			1			—			1
OCI	—			—			—			1			—			1
AOCI, end of period	$	(12	)	$	(1	)	$	(11	)	$	(25	)	$	(8	)	$	(17	)
Life deferred acquisition costs, life policy reserves and other:
AOCI, beginning of period	$	(10	)	$	(2	)	$	(8	)	$	(9	)	$	(3	)	$	(6	)
OCI before realized gains and losses recognized in net   income	6			1			5			3			2			1
Realized gains recognized in net income	—			—			—			(1		)	(1		)	—
OCI	6			1			5			2			1			1
AOCI, end of period	$	(4	)	$	(1	)	$	(3	)	$	(7	)	$	(2	)	$	(5	)
Summary of AOCI:
AOCI, beginning of period	$	3,518		$	730		$	2,788		$	2,590		$	897		$	1,693
Cumulative effect of change in accounting for equity securities as of January 1, 2018	(3,155		)	(652		)	(2,503		)	—			—			—
Adjusted AOCI, beginning of period	363			78			285			2,590			897			1,693
Investments OCI	(221		)	(46		)	(175		)	131			46			85
Pension obligations OCI	—			—			—			1			—			1
Life deferred acquisition costs, life policy reserves and other OCI	6			1			5			2			1			1
Total OCI	(215		)	(45		)	(170		)	134			47			87
AOCI, end of period	$	148		$	33		$	115		$	2,724		$	944		$	1,780

Investment gains and losses, net and life deferred acquisition costs, life policy reserves and other investment gains and losses, net, are recorded in the investment gains and losses, net, line item in the condensed consolidated statements of income. Amortization on pension obligations is recorded in the insurance losses and contract holders'

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benefits and underwriting, acquisition and insurance expenses in the condensed consolidated statements of income.

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NOTE 8 – Reinsurance

Primary components of our property casualty reinsurance assumed operations include involuntary and voluntary assumed risks as well as contracts from our reinsurance assumed operations, known as Cincinnati Re. Primary components of our ceded reinsurance include a property per risk treaty, property excess treaty, casualty per occurrence treaty, casualty excess treaty, property catastrophe treaty and catastrophe bonds and retrocessions on our reinsurance assumed operations. Management's decisions about the appropriate level of risk retention are affected by various factors, including changes in our underwriting practices, capacity to retain risks and reinsurance market conditions.

The tables below summarize our consolidated property casualty insurance net written premiums, earned premiums and incurred loss and loss expenses:

(Dollars in millions)	Three months ended March 31,
	2018			2017
Direct written premiums	$	1,247		$	1,226
Assumed written premiums	49			33
Ceded written premiums	(38		)	(28		)
Net written premiums	$	1,258		$	1,231

(Dollars in millions)	Three months ended March 31,
	2018			2017
Direct earned premiums	$	1,207		$	1,163
Assumed earned premiums	33			27
Ceded earned premiums	(40		)	(39		)
Earned premiums	$	1,200		$	1,151

(Dollars in millions)	Three months ended March 31,
	2018			2017
Direct incurred loss and loss expenses	$	781		$	788
Assumed incurred loss and loss expenses	16			15
Ceded incurred loss and loss expenses	(6		)	(15		)
Incurred loss and loss expenses	$	791		$	788

Our life insurance company purchases reinsurance for protection of a portion of the risks that are written. Primary components of our life reinsurance program include individual mortality coverage, aggregate catastrophe and accidental death coverage in excess of certain deductibles.

The tables below summarize our consolidated life insurance earned premiums and contract holders' benefits incurred:

(Dollars in millions)	Three months ended March 31,
	2018			2017
Direct earned premiums	$	77		$	74
Ceded earned premiums	(17		)	(17		)
Earned premiums	$	60		$	57

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(Dollars in millions)	Three months ended March 31,
	2018			2017
Direct contract holders' benefits incurred	$	76		$	76
Ceded contract holders' benefits incurred	(13		)	(11		)
Contract holders' benefits incurred	$	63		$	65

The ceded benefits incurred can vary depending on the type of life insurance policy held and the year the policy was issued.

NOTE 9 – Income Taxes

As of March 31, 2018, and December 31, 2017, we had no liability for unrecognized tax benefits.

The differences between the 21 percent and 35 percent statutory federal income tax rates and our effective income tax rate were as follows:

(Dollars in millions)	Three months ended March 31,
	2018					2017
Tax at statutory rate:	$	(11	)	21.0	%	$	97		35.0	%
Increase (decrease) resulting from:
Tax-exempt income from municipal bonds	(5		)	10.0		(9		)	(3.3	)
Dividend received exclusion	(3		)	6.0		(8		)	(2.9	)
Other	—			1.0		(5		)	(1.6	)
Provision for income taxes	$	(19	)	38.0	%	$	75		27.2	%

The provision for federal income taxes is based upon filing a consolidated income tax return for the company and its subsidiaries.

Our 2017 10-K discusses enactment of the Tax Cuts and Jobs Act (the “Tax Act”) on December 22, 2017, and its impact on our financial results for that period. Interpretive guidance of the Tax Act will be received throughout 2018, and we expect to update our estimates and our disclosure on a quarterly basis as interpretative guidance is received within each quarter that it is received. During the period ended March 31, 2018, the U.S. Treasury Department (the “Treasury”) and the Internal Revenue Service (the ”IRS”) have not issued further clarification or guidance for the items for which our accounting for the Tax Act is incomplete. We expect to complete determination of the effects of the Tax Act on our deferred tax assets and liabilities as part of the annual income tax return filing process.

As of March 31, 2018, we had no operating or capital loss carryforwards.

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NOTE 10 – Net Income (Loss) Per Common Share

Basic earnings per share are computed based on the weighted average number of common shares outstanding. Diluted earnings per share are computed based on the weighted average number of common and dilutive potential common shares outstanding using the treasury stock method. The table shows calculations for basic and diluted earnings per share:

(In millions, except per share data)	Three months ended March 31,
	2018			2017
Numerator:
Net income (loss)—basic and diluted	$	(31	)	$	201
Denominator:
Basic weighted-average common shares outstanding	164.0			164.6
Effect of share-based awards:
Stock options	—			1.1
Nonvested shares	—			0.8
Diluted weighted-average shares	164.0			166.5
Earnings per share:
Basic	$	(0.19	)	$	1.22
Diluted	(0.19		)	1.21
Number of anti-dilutive share-based awards	2.8			0.7

In accordance with ASC 260, Earnings per Share, the assumed exercise of share-based awards in 2018 were excluded from the computation of diluted loss per share. See our 2017 Annual Report on Form 10-K, Item 8, Note 17, Share-Based Associate Compensation Plans, Page 161, for information about share-based awards. The above table shows the number of anti-dilutive share-based awards for the three months endedMarch 31, 2018 and 2017. These share-based awards were not included in the computation of net income (loss) per common share (diluted) because their exercise would have anti-dilutive effects.

NOTE 11 – Employee Retirement Benefits

The following summarizes the components of net periodic benefit cost for our qualified and supplemental pension plans:

(Dollars in millions)	Three months ended March 31,
	2018			2017
Service cost	$	3		$	3
Non-service costs (benefit):
Interest cost	3			3
Expected return on plan assets	(5		)	(5		)
Amortization of actuarial loss and prior service cost	—			1
Total non-service benefit	(2		)	(1		)
Net periodic benefit cost	$	1		$	2

See our 2017 Annual Report on Form 10-K, Item 8, Note 13, Employee Retirement Benefits, Page 156, for information on our retirement benefits. Service costs and non-service costs (benefit) are allocated in the same proportion primarily to underwriting, acquisition and insurance expenses line item with the remainder allocated to insurance losses and contract holders' benefits line item on the consolidated statements of income for both 2018 and 2017.

We made matching contributions totaling $6 million to our 401(k) and Top Hat savings plans during the first quarter of 2018 and 2017.

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We contributed $5 million to our qualified pension plan during the first three months of 2018.

NOTE 12 – Commitments and Contingent Liabilities

In the ordinary course of conducting business, the company and its subsidiaries are named as defendants in various legal proceedings. Most of these proceedings are claims litigation involving the company's insurance subsidiaries in which the company is either defending or providing indemnity for third-party claims brought against insureds or litigating first-party coverage claims. The company accounts for such activity through the establishment of unpaid loss and loss expense reserves. We believe that the ultimate liability, if any, with respect to such ordinary-course claims litigation, after consideration of provisions made for potential losses and costs of defense, is immaterial to our consolidated financial condition, results of operations and cash flows.

The company and its subsidiaries also are occasionally involved in other legal and regulatory proceedings, some of which assert claims for substantial amounts. These actions include, among others, putative class actions seeking certification of a state or national class. Such proceedings have alleged, for example, breach of an alleged duty to search national databases to ascertain unreported deaths of insureds under life insurance policies. The company's insurance subsidiaries also are occasionally parties to individual actions in which extra-contractual damages, punitive damages or penalties are sought, such as claims alleging bad faith handling of insurance claims or writing unauthorized coverage or claims alleging discrimination by former or current associates.

On a quarterly basis, we review these outstanding matters. Under current accounting guidance, we establish accruals when it is probable that a loss has been incurred and we can reasonably estimate its potential exposure. The company accounts for such probable and estimable losses, if any, through the establishment of legal expense reserves. Based on our quarterly review, we believe that our accruals for probable and estimable losses are reasonable and that the amounts accrued do not have a material effect on our consolidated financial condition or results of operations. However, if any one or more of these matters results in a judgment against us or settlement for an amount that is significantly greater than the amount accrued, the resulting liability could have a material effect on the company's consolidated results of operations or cash flows. Based on our most recent review, our estimate for any other matters for which the risk of loss is not probable, but more than remote, is immaterial.

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NOTE 13 – Segment Information

We operate primarily in two industries, property casualty insurance and life insurance. Our chief operating decision maker regularly reviews our reporting segments to make decisions about allocating resources and assessing performance. Our reporting segments are:

• Commercial lines insurance

• Personal lines insurance

• Excess and surplus lines insurance

• Life insurance

• Investments

We report as Other the noninvestment operations of the parent company and its noninsurer subsidiary, CFC Investment Company and Cincinnati Re, our reinsurance assumed operations. See our 2017 Annual Report on Form 10-K, Item 8, Note 18, Segment Information, Page 164, for a description of revenue, income or loss before income taxes and identifiable assets for each of the five segments.

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Segment information is summarized in the following table: 

(Dollars in millions)	Three months ended March 31,
	2018			2017
Revenues:
Commercial lines insurance
Commercial casualty	$	265		$	265
Commercial property	228			223
Commercial auto	161			155
Workers' compensation	80			84
Other commercial	56			54
Commercial lines insurance premiums	790			781
Fee revenues	2			1
Total commercial lines insurance	792			782
Personal lines insurance
Personal auto	151			141
Homeowner	136			125
Other personal	38			34
Personal lines insurance premiums	325			300
Fee revenues	1			2
Total personal lines insurance	326			302
Excess and surplus lines insurance	56			48
Life insurance premiums	60			57
Fee revenues	1			2
Total life insurance	61			59
Investments
Investment income, net of expenses	150			149
Investment gains and losses, net	(191		)	160
Total investment revenue	(41		)	309
Other
Cincinnati Re insurance premiums	29			22
Other	1			1
Total other revenues	30			23
Total revenues	$	1,224		$	1,523
Income (loss) before income taxes:
Insurance underwriting results
Commercial lines insurance	$	15		$	(2	)
Personal lines insurance	(9		)	(15		)
Excess and surplus lines insurance	18			18
Life insurance	2			—
Investments	(65		)	286
Other	(11		)	(11		)
Total income (loss) before income taxes	$	(50	)	$	276

Identifiable assets:	March 31, 2018		December 31, 2017
Property casualty insurance	$	2,888	$	2,863
Life insurance	1,418		1,409
Investments	16,748		17,112
Other	416		459
Total	$	21,470	$	21,843

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Item 2.    Management’s Discussion and Analysis of Financial Condition and

Results of Operations

The following discussion highlights significant factors influencing the condensed consolidated results of operations and financial position of Cincinnati Financial Corporation. It should be read in conjunction with the consolidated financial statements and related notes included in our 2017 Annual Report on Form 10-K. Unless otherwise noted, the industry data is prepared by A.M. Best Co., a leading insurance industry statistical, analytical and financial strength rating organization. Information from A.M. Best is presented on a statutory basis. When we provide our results on a comparable statutory basis, we label it as such; all other company data is presented in accordance with accounting principles generally accepted in the United States of America (GAAP).

We present per share data on a diluted basis unless otherwise noted, adjusting those amounts for all stock splits and dividends. Dollar amounts are rounded to millions; calculations of percent changes are based on dollar amounts rounded to the nearest million. Certain percentage changes are identified as not meaningful (nm).

SAFE HARBOR STATEMENT

This is our “Safe Harbor” statement under the Private Securities Litigation Reform Act of 1995. Our business is subject to certain risks and uncertainties that may cause actual results to differ materially from those suggested by the forward-looking statements in this report. Some of those risks and uncertainties are discussed in our 2017 Annual Report on Form 10-K, Item 1A, Risk Factors, Page 30.

Factors that could cause or contribute to such differences include, but are not limited to:

• Unusually high levels of catastrophe losses due to risk concentrations, changes in weather patterns, environmental events, terrorism incidents or other causes

• Increased frequency and/or severity of claims or development of claims that are unforeseen at the time of policy issuance

• Inadequate estimates, assumptions or reliance on third-party data used for critical accounting estimates

• Declines in overall stock market values negatively affecting the company’s equity portfolio and book value

• Prolonged low interest rate environment or other factors that limit the company’s ability to generate growth in investment income or interest rate fluctuations that result in declining values of fixed-maturity investments, including declines in accounts in which we hold bank-owned life insurance contract assets

• Domestic and global events resulting in capital market or credit market uncertainty, followed by prolonged periods of economic instability or recession, that lead to:

◦ Significant or prolonged decline in the fair value of a particular security or group of securities and impairment of the asset(s)

◦ Significant decline in investment income due to reduced or eliminated dividend payouts from a particular security or group of securities

◦ Significant rise in losses from surety and director and officer policies written for financial institutions or other insured entities

• Recession or other economic conditions resulting in lower demand for insurance products or increased payment delinquencies

• Difficulties with technology or data security breaches, including cyberattacks, that could negatively affect our ability to conduct business and our relationships with agents, policyholders and others

• Disruption of the insurance market caused by technology innovations such as driverless cars that could decrease consumer demand for insurance products

• Delays, inadequate data developed internally or from third parties, or performance inadequacies from ongoing development and implementation of underwriting and pricing methods, including telematics and other usage-based insurance methods, or technology projects and enhancements expected to increase our pricing accuracy, underwriting profit and competitiveness

• Increased competition that could result in a significant reduction in the company’s premium volume

• Changing consumer insurance-buying habits and consolidation of independent insurance agencies that could alter our competitive advantages

• Inability to obtain adequate ceded reinsurance on acceptable terms, amount of reinsurance coverage purchased, financial strength of reinsurers and the potential for nonpayment or delay in payment by reinsurers

• Inability to defer policy acquisition costs for any business segment if pricing and loss trends would lead management to conclude that segment could not achieve sustainable profitability

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• Inability of our subsidiaries to pay dividends consistent with current or past levels

• Events or conditions that could weaken or harm the company’s relationships with its independent agencies and hamper opportunities to add new agencies, resulting in limitations on the company’s opportunities for growth, such as:

◦ Downgrades of the company’s financial strength ratings

◦ Concerns that doing business with the company is too difficult

◦ Perceptions that the company’s level of service, particularly claims service, is no longer a distinguishing characteristic in the marketplace

◦ Inability or unwillingness to nimbly develop and introduce coverage product updates and innovations that our competitors offer and consumers expect to find in the marketplace

• Actions of insurance departments, state attorneys general or other regulatory agencies, including a change to a federal system of regulation from a state-based system, that:

◦ Impose new obligations on us that increase our expenses or change the assumptions underlying our critical accounting estimates

◦ Place the insurance industry under greater regulatory scrutiny or result in new statutes, rules and regulations

◦ Restrict our ability to exit or reduce writings of unprofitable coverages or lines of business

◦ Add assessments for guaranty funds, other insurance‑related assessments or mandatory reinsurance arrangements; or that impair our ability to recover such assessments through future surcharges or other rate changes

◦ Increase our provision for federal income taxes due to changes in tax law

◦ Increase our other expenses

◦ Limit our ability to set fair, adequate and reasonable rates

◦ Place us at a disadvantage in the marketplace

◦ Restrict our ability to execute our business model, including the way we compensate agents

• Adverse outcomes from litigation or administrative proceedings

• Events or actions, including unauthorized intentional circumvention of controls, that reduce the company’s future ability to maintain effective internal control over financial reporting under the Sarbanes-Oxley Act of 2002

• Unforeseen departure of certain executive officers or other key employees due to retirement, health or other causes that could interrupt progress toward important strategic goals or diminish the effectiveness of certain longstanding relationships with insurance agents and others

• Events, such as an epidemic, natural catastrophe or terrorism, that could hamper our ability to assemble our workforce at our headquarters location

Further, the company’s insurance businesses are subject to the effects of changing social, global, economic and regulatory environments. Public and regulatory initiatives have included efforts to adversely influence and restrict premium rates, restrict the ability to cancel policies, impose underwriting standards and expand overall regulation. The company also is subject to public and regulatory initiatives that can affect the market value for its common stock, such as measures affecting corporate financial reporting and governance. The ultimate changes and eventual effects, if any, of these initiatives are uncertain.

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CORPORATE FINANCIAL HIGHLIGHTS

Net Income (Loss) and Comprehensive Income (Loss) Data

(Dollars in millions, except per share data)	Three months ended March 31,
	2018			2017		% Change
Earned premiums	$	1,260		$	1,208	4
Investment income, net of expenses (pretax)	150			149		1
Investment gains and losses, net (pretax)	(191		)	160		nm
Total revenues	1,224			1,523		(20	)
Net income (loss)	(31		)	201		nm
Comprehensive income (loss)	(201		)	288		nm
Net income (loss) per share—diluted	(0.19		)	1.21		nm
Cash dividends declared per share	0.53			0.50		6
Diluted weighted average shares outstanding	164.0			166.5		(2	)

Total revenues decreased for the first quarter of 2018, compared with the same period of 2017, as higher earned premiums were offset by a reduction in net investment gains. Premium and investment revenue trends are discussed further in the respective sections of Financial Results.

Investment gains and losses are recognized on the sales of investments, on certain changes in fair values of securities even though we continue to hold the securities or as otherwise required by GAAP. We have substantial discretion in the timing of investment sales, and that timing generally is independent of the insurance underwriting process. The change in fair value of securities is also generally independent of the insurance underwriting process.

The net loss for first-quarter of 2018, compared with first-quarter 2017 net income, was a change of $232 million, primarily due to a $254 million decrease in after-tax net investment gains and losses that offset a $19 million increase in after-tax property casualty underwriting income. New accounting requirements adopted during the first quarter of 2018 resulted in reporting, through net income, the change in fair value for equity securities still held, as disclosed in this quarterly report Item 1, Note 1, Accounting Policies, and Note 2, Investments. Included in the $254 million decrease in net investment gains was $156 million from the recognition of fair value changes of equity securities still held that prior to 2018 would have been reported in other comprehensive income instead of net income. Catastrophe losses, mostly weather related, were $27 million less after taxes and favorably affected both net income and property casualty underwriting income. First-quarter 2018 after-tax investment income in our investments segment results rose $13 million. Life insurance segment results on a pretax basis for the first quarter of 2018 rose $2 million compared with the first quarter of 2017.

Performance by segment is discussed below in Financial Results. As discussed in our 2017 Annual Report on Form 10-K, Item 7, Factors Influencing Our Future Performance, Page 48, there are several reasons that our performance during 2018 may be below our long-term targets. In that annual report, as part of Financial Results, we also discussed the full-year 2018 outlook for each reporting segment.

The board of directors is committed to rewarding shareholders directly through cash dividends and through share repurchase authorizations. Through 2017, the company had increased the annual cash dividend rate for 57 consecutive years, a record we believe is matched by only seven other publicly traded companies. In January 2018, the board of directors increased the regular quarterly dividend to 53 cents per share, setting the stage for our 58^th consecutive year of increasing cash dividends. During the first three months of 2018, cash dividends declared by the company increased 6 percent compared with the same period of 2017. Our board regularly evaluates relevant factors in decisions related to dividends and share repurchases. The 2018 dividend increase reflected our strong earnings performance and signaled management’s and the board’s positive outlook and confidence in our outstanding capital, liquidity and financial flexibility.

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Balance Sheet Data and Performance Measures

(Dollars in millions, except share data)	At March 31,			At December 31,
	2018			2017
Total investments	$	16,721		$	17,051
Total assets	21,470			21,843
Short-term debt	24			24
Long-term debt	787			787
Shareholders' equity	7,946			8,243
Book value per share	48.42			50.29
Debt-to-total-capital ratio	9.3		%	9.0		%

Total assets at March 31, 2018, decreased 2 percent compared with year-end 2017, and included a 2 percent decrease in investments that reflected net purchases that were offset by lower fair values for many securities in our portfolio. Shareholders’ equity decreased 4 percent, and book value per share also decreased 4 percent during the first three months of 2018. Our debt-to-total-capital ratio (capital is the sum of debt plus shareholders’ equity) was slightly higher than at year-end 2017.

Our value creation is our primary performance metric. That ratio was negative 2.7 percent for the first three months of 2018, and was less than the same period in 2017 due to a decrease in overall net gains from our investment portfolio. The $1.87 decrease in book value per share during the first three months of 2018 contributed negative 3.7 percentage points to the value creation ratio, while dividends declared at $0.53 per share contributed positive 1.0 points. Value creation ratios for comparable periods by major components and in total, along with a calculations from per-share amounts, are shown in the tables below.

	Three months ended March 31,
	2018		2017
Value creation ratio major components:
Net income before investment gains	1.5	%	1.4	%
Change in fixed-maturity securities, realized and unrealized gains	(2.1	)	0.4
Change in equity securities, investment gains	(1.9	)	2.3
Other	(0.2	)	(0.3	)
Value creation ratio	(2.7	)%	3.8	%

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(Dollars are per share)	Three months ended March 31,
	2018			2017
Value creation ratio:
End of period book value*	$	48.42		$	44.07
Less beginning of period book value	50.29			42.95
Change in book value	(1.87		)	1.12
Dividend declared to shareholders	0.53			0.50
Total value creation	$	(1.34	)	$	1.62
Value creation ratio from change in book value**	(3.7		)%	2.6		%
Value creation ratio from dividends declared to shareholders***	1.0			1.2
Value creation ratio	(2.7		)%	3.8		%
* Book value per share is calculated by dividing end of period total shareholders' equity by end of period shares outstanding
** Change in book value divided by the beginning of period book value
*** Dividend declared to shareholders divided by beginning of period book value

DRIVERS OF LONG-TERM VALUE CREATION

Operating through The Cincinnati Insurance Company, Cincinnati Financial Corporation is one of the 25 largest property casualty insurers in the nation, based on 2017 net written premiums for approximately 2,000 U.S. stock and mutual insurer groups. We market our insurance products through a select group of independent insurance agencies as discussed in our 2017 Annual Report on Form 10-K, Item 1, Our Business and Our Strategy, Page 5. At March 31, 2018, we actively marketed through agencies located in 42 states. We maintain a long-term perspective that guides us in addressing immediate challenges or opportunities while focusing on the major decisions that best position our company for success through all market cycles.

To measure our long-term progress in creating shareholder value, our value creation ratio is our primary financial performance target. As discussed in our 2017 Annual Report on Form 10-K, Item 7, Executive Summary, Page 44, management believes this measure is a meaningful indicator of our long-term progress in creating shareholder value and has three primary performance drivers:

• Premium growth – We believe our agency relationships and initiatives can lead to a property casualty written premium growth rate over any five-year period that exceeds the industry average. For the first three months of 2018, our consolidated property casualty net written premium year-over-year growth was 2 percent. As of February 2018, A.M. Best projected the industry's full-year 2018 written premium growth at approximately 4 percent. For the five-year period 2013 through 2017, our growth rate was nearly double that of the industry. The industry's growth rate excludes its mortgage and financial guaranty lines of business.

• Combined ratio – We believe our underwriting philosophy and initiatives can generate a GAAP combined ratio over any five-year period that is consistently within the range of 95 percent to 100 percent. For the first three months of 2018, our GAAP combined ratio was 97.9 percent and our statutory combined ratio was 96.4 percent, both including 5.0 percentage points of current accident year catastrophe losses partially offset by 3.9 percentage points of favorable loss reserve development on prior accident years. As of February 2018, A.M. Best projected the industry's full-year 2018 statutory combined ratio at approximately 100 percent, including approximately 5 percentage points of catastrophe losses and a favorable effect of approximately 1 percentage point of loss reserve development on prior accident years. The industry's ratio again excludes its mortgage and financial guaranty lines of business.

• Investment contribution – We believe our investment philosophy and initiatives can drive investment income growth and lead to a total return on our equity investment portfolio over a five-year period that exceeds the five-year return of the Standard & Poor’s 500 Index. For the first three months of 2018, pretax investment income was $150 million, up 1 percent compared with the same period in 2017. We believe our investment portfolio mix provides an appropriate balance of income stability and growth with capital appreciation potential.

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Highlights of Our Strategy and Supporting Initiatives

Management has worked to identify a strategy that can lead to long-term success, with concurrence by the board of directors. Our strategy is intended to position us to compete successfully in the markets we have targeted while appropriately managing risk. Further description of our long-term, proven strategy can be found in our 2017 Annual Report on Form 10-K, Item 1, Our Business and Our Strategy, Page 5. We believe successful implementation of initiatives that support our strategy will help us better serve our agent customers and reduce volatility in our financial results while we also grow earnings and book value over the long term, successfully navigating challenging economic, market or industry pricing cycles.

• Manage insurance profitability – Implementation of these initiatives is intended to enhance underwriting expertise and knowledge, thereby increasing our ability to manage our business while also gaining efficiency. Better profit margins can arise from additional information and more focused action on underperforming product lines, plus pricing capabilities we are expanding through the use of technology and analytics. In addition to enhancing company efficiency, improving internal processes also supports the ability of the independent agencies that represent us to grow profitably by allowing them to serve clients faster and to more efficiently manage agency expenses.

We continue to enhance our property casualty underwriting expertise and to effectively and efficiently underwrite individual policies and process transactions. Ongoing initiatives supporting this work include expanding our pricing and segmentation capabilities through experience and use of predictive analytics and additional data. Our segmentation efforts emphasize identification and retention of insurance policies we believe have relatively stronger pricing, while seeking more aggressive renewal terms and conditions on policies we believe have relatively weaker pricing. In 2018, we continue to improve underwriting and rate adequacy for our commercial auto and personal auto lines of business. Our commercial auto policies that renewed during the first three months of 2018 experienced an estimated average price increase at percentages in the high-single-digit range, and our personal auto policies that renewed during that period also averaged an estimated price increase at percentages in the high-single-digit range.

• Drive premium growth – Implementation of these initiatives is intended to further penetrate each market we serve through our independent agencies. Strategies aimed at specific market opportunities, along with service enhancements, can help our agents grow and increase our share of their business. Premium growth initiatives also include expansion of Cincinnati Re^SM – our reinsurance assumed operation. Diversified growth also may reduce variability of losses from weather-related catastrophes.

We continue to appoint new agencies to develop additional points of distribution. In 2018, we are planning approximately 100 appointments of independent agencies that offer most or all of our property casualty insurance products. During the first three months of 2018, we appointed 22 new agencies that meet that criteria.

We also plan to appoint additional agencies that focus on high net worth personal lines clients. In 2018, we are targeting the appointment of approximately 100 agencies that market only personal lines products for us. During the first three months of 2018, we appointed 24 new agencies that meet that criteria.

As of March 31, 2018, a total of 1,724 agency relationships market our property casualty insurance products from 2,288 reporting locations.

We also continue to grow premiums through the disciplined expansion of Cincinnati Re. During the first three months of 2018, Cincinnati Re contributed $6 million of growth in consolidated property casualty insurance net written premiums.

Financial Strength

An important part of our long-term strategy is financial strength, which is described in our 2017 Annual Report on Form 10-K, Item 1, Our Business and Our Strategy, Financial Strength, Page 8. One aspect of our financial strength is prudent use of reinsurance ceded to help manage financial performance variability due to catastrophe loss experience. A description of how we use reinsurance ceded is included in our 2017 Annual Report on Form 10-K, Item 7, Liquidity and Capital Resources, 2018 Reinsurance Ceded Programs, Page 99. Another aspect of our financial strength is our investment portfolio, which remains well-diversified as discussed in this quarterly report in Item 3, Quantitative and Qualitative Disclosures About Market Risk. Our strong parent-company liquidity and financial strength increase our flexibility to maintain a cash dividend through all periods and to continue to invest in and expand our insurance operations.

At March 31, 2018, we held $2.532 billion of our cash and invested assets at the parent-company level, of which $2.295 billion, or 90.6 percent, was invested in common stocks, and $160 million, or 6.3 percent, was cash or

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cash equivalents. Our debt-to-total-capital ratio was 9.3 percent at March 31, 2018. Another important indicator of financial strength is our ratio of property casualty net written premiums to statutory surplus, which was 1.0-to-1 for the 12 months ended March 31, 2018, matching year-end 2017.

Financial strength ratings assigned to us by independent rating firms also are important. In addition to rating our parent company’s senior debt, four firms award insurer financial strength ratings to one or more of our insurance subsidiary companies based on their quantitative and qualitative analyses. These ratings primarily assess an insurer’s ability to meet financial obligations to policyholders and do not necessarily address all of the matters that may be important to investors. Ratings are under continuous review and subject to change or withdrawal at any time by the rating agency. Each rating should be evaluated independently of any other rating; please see each rating agency's website for its most recent report on our ratings.

At April 24, 2018, our insurance subsidiaries continued to be highly rated.

Insurer Financial Strength Ratings
Rating agency	Standard market property casualty insurance subsidiaries			Life insurance  subsidiary			Excess and surplus lines insurance subsidiary			Outlook
			Rating tier			Rating tier			Rating tier
A.M. Best Co. ambest.com	A+	Superior	2 of 16	A	Excellent	3 of 16	A+	Superior	2 of 16	Stable/ Positive/ Stable
Fitch Ratings fitchratings.com	A+	Strong	5 of 21	A+	Strong	5 of 21	-	-	-	Stable
Moody's Investors  Service moodys.com	A1	Good	5 of 21	-	-	-	-	-	-	Stable
S&P Global  Ratings spratings.com	A+	Strong	5 of 21	A+	Strong	5 of 21	-	-	-	Stable

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CONSOLIDATED PROPERTY CASUALTY INSURANCE HIGHLIGHTS

Consolidated property casualty insurance results include premiums and expenses for our standard market insurance segments (commercial lines and personal lines), our excess and surplus lines segment and our reinsurance assumed operations.

(Dollars in millions)	Three months ended March 31,
	2018			2017			% Change
Earned premiums	$	1,200		$	1,151		4
Fee revenues	3			3			0
Total revenues	1,203			1,154			4
Loss and loss expenses from:
Current accident year before catastrophe losses	779			709			10
Current accident year catastrophe losses	60			117			(49	)
Prior accident years before catastrophe losses	(41		)	(27		)	(52	)
Prior accident years catastrophe losses	(7		)	(11		)	36
Loss and loss expenses	791			788			0
Underwriting expenses	383			360			6
Underwriting profit	$	29		$	6		383
Ratios as a percent of earned premiums:							Pt. Change
Current accident year before catastrophe losses	64.9		%	61.6		%	3.3
Current accident year catastrophe losses	5.0			10.2			(5.2	)
Prior accident years before catastrophe losses	(3.3		)	(2.4		)	(0.9	)
Prior accident years catastrophe losses	(0.6		)	(1.0		)	0.4
Loss and loss expenses	66.0			68.4			(2.4	)
Underwriting expenses	31.9			31.3			0.6
Combined ratio	97.9		%	99.7		%	(1.8	)
Combined ratio	97.9		%	99.7		%	(1.8	)
Contribution from catastrophe losses and prior years reserve development	1.1			6.8			(5.7	)
Combined ratio before catastrophe losses and prior years reserve development	96.8		%	92.9		%	3.9

Our consolidated property casualty insurance operations generated an underwriting profit of $29 million for the first quarter of 2018. The increase of $23 million, compared with the same period of 2017, in part reflected a decrease of $53 million in losses from natural catastrophes that were mostly weather related. Weather-related losses not identified as part of designated catastrophe events for the property casualty industry, typically referred to as noncatastrophe weather losses, increased by $43 million in the first quarter of 2018, and partially offset the decrease in catastrophe losses. First-quarter 2018 also experienced a higher amount of favorable reserve development on prior accident years. We believe future property casualty underwriting results will continue to benefit from price increases and our ongoing initiatives to improve pricing precision and loss experience related to claims and loss control practices.

For all property casualty lines of business in aggregate, net loss and loss expense reserves at March 31, 2018, were $77 million higher than at year-end 2017, including $6 million for the incurred but not reported (IBNR) portion. The $77 million reserve increase raised year-end 2017 net loss and loss expense reserves by 2 percent.

We measure and analyze property casualty underwriting results primarily by the combined ratio and its component ratios. The GAAP-basis combined ratio is the percentage of incurred losses plus all expenses per each earned premium dollar – the lower the ratio, the better the performance. An underwriting profit results when the combined ratio is below 100 percent. A combined ratio above 100 percent indicates that an insurance company’s losses and expenses exceeded premiums.

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Our consolidated property casualty combined ratio for the first quarter of 2018 decreased by 1.8 percentage points, compared with the same period of 2017, including 4.8 points from lower catastrophe losses and loss expenses. Noncatastrophe weather-related losses were 3.5 points higher, and partially offset the decrease in the ratio for castastrophe losses.

The combined ratio can be affected significantly by natural catastrophe losses and other large losses as discussed in detail below. The combined ratio can also be affected by updated estimates of loss and loss expense reserves established for claims that occurred in prior periods, referred to as prior accident years. Net favorable development on prior accident year reserves, including reserves for catastrophe losses, benefited the combined ratio by 3.9 percentage points in the first three months of 2018, compared with 3.4 percentage points in the same period of 2017. Net favorable development is discussed in further detail in Financial Results by property casualty insurance segment.

The ratio for current accident year loss and loss expenses before catastrophe losses rose in the first three months of 2018. That 64.9 percent ratio increased 3.3 percentage points compared with the 61.6 percent accident year 2017 ratio measured as of March 31, 2017, including a decrease of 0.9 percentage points in the ratio for large losses of $1 million or more per claim, discussed below. The effects of higher 2018 noncatastrophe weather-related losses contributed significantly to the overall increase in the current accident year ratio.

The underwriting expense ratio for the first three months of 2018 increased, compared with the same period of 2017, reflecting a lower amount of deferred acquisition costs that was partially offset by higher earned premiums and ongoing expense management efforts.

Consolidated Property Casualty Insurance Premiums

(Dollars in millions)	Three months ended March 31,
	2018			2017			% Change
Agency renewal written premiums	$	1,083		$	1,057		2
Agency new business written premiums	159			153			4
Cincinnati Re net written premiums	46			40			15
Other written premiums	(30		)	(19		)	(58	)
Net written premiums	1,258			1,231			2
Unearned premium change	(58		)	(80		)	28
Earned premiums	$	1,200		$	1,151		4

The trends in net written premiums and earned premiums summarized in the table above include the effects of price increases. Price change trends that heavily influence renewal written premium increases or decreases, along with other premium growth drivers for 2018, are discussed in more detail by segment below in Financial Results.

Consolidated property casualty net written premiums for the three months ended March 31, 2018, grew $27 million compared with the same period of 2017. Our premium growth initiatives from prior years have provided an ongoing favorable effect on growth during the current year, particularly as newer agency relationships mature over time.

Consolidated property casualty agency new business written premiums rose $6 million for the first quarter of 2018, compared with the same period of 2017. New business written premiums in the first three months of 2018 were higher than the same period of 2017 for each of our property casualty insurance segments. New agency appointments during 2017 and 2018 produced a $13 million increase in standard lines new business for the first three months of 2018 compared with the same period of 2017. As we appoint new agencies that choose to move accounts to us, we report these accounts as new business. While this business is new to us, in many cases it is not new to the agent. We believe these seasoned accounts tend to be priced more accurately than business that may be less familiar to our agent upon obtaining it from a competing agent.

Net written premiums for Cincinnati Re increased $6 million for the first three months of 2018, compared with the same period of 2017. Cincinnati Re assumes risks through reinsurance treaties and in some cases cedes part of the risk and related premiums to one or more unaffiliated reinsurance companies through transactions known as

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retrocessions. For the first three months of 2018, earned premiums for Cincinnati Re totaled $29 million, compared with $22 million earned in the same period a year ago.

Other written premiums include premiums ceded to reinsurers as part of our reinsurance ceded program. Those ceded premium totals for the first three months of 2018 were substantially similar to the same period of 2017.

Catastrophe losses and loss expenses typically have a material effect on property casualty results and can vary significantly from period to period. Losses from natural catastrophes contributed 4.4 percentage points to the combined ratio in the first three months of 2018, compared with 9.2 percentage points in the same period of 2017. Some of those losses were applicable to annual loss deductible provisions of our collateralized reinsurance funded through catastrophe bonds. For our collateralized reinsurance arrangement that became effective in January 2017, we can recover catastrophe bond funds if aggregate losses, after the $8 million per occurrence deductible, exceed $190 million during an annual coverage period. Aggregate losses from three events between January 1 and March 31, 2018, which occurred within the specific geographic locations included in the severe convective storm portion of our coverage, totaled $23 million, after our per occurrence deductible. The following table shows consolidated property casualty insurance catastrophe losses and loss expenses incurred, net of reinsurance, as well as the effect of loss development on prior period catastrophe events. We individually list declared catastrophe events for which our incurred losses reached or exceeded $10 million.

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Consolidated Property Casualty Insurance Catastrophe Losses and Loss Expenses Incurred

(Dollars in millions, net of reinsurance)			Three months ended March 31,
			Comm.			Pers.			E&S		Cin.
Dates	Event	Region	lines			lines			lines		Re			Total
2018
Jan. 8-10	Flood, wind	West	$	—		$	11		$	—	$	—		$	11
Mar. 1-3	Freezing, ice, snow, wind	Northeast, South	6			6			—		—			12
Mar. 18-21	Flood, hail, wind	South	17			5			1		—			23
All other 2018 catastrophes			7			7			—		—			14
Development on 2017 and prior catastrophes			(7		)	—			—		—			(7		)
Calendar year incurred total			$	23		$	29		$	1	$	—		$	53
2017
Feb. 28-Mar. 1	Flood, hail, wind	Midwest, South	$	21		$	20		$	1	$	—		$	42
Mar. 6-9	Flood, hail, wind	Midwest, Northeast, South	22			13			—		—			35
Mar. 21-22	Flood, hail, wind	South	13			10			—		—			23
All other 2017 catastrophes			12			5			—		—			17
Development on 2016 and prior catastrophes			(9		)	(1		)	—		(1		)	(11		)
Calendar year incurred total			$	59		$	47		$	1	$	(1	)	$	106

The following table includes data for losses incurred of $1 million or more per claim, net of reinsurance.

Consolidated Property Casualty Insurance Losses Incurred by Size

(Dollars in millions, net of reinsurance)	Three months ended March 31,
	2018			2017			% Change
Current accident year losses greater than $5 million	$	15		$	28		(46	)
Current accident year losses $1 million - $5 million	32			29			10
Large loss prior accident year reserve development	34			17			100
Total large losses incurred	81			74			9
Losses incurred but not reported	10			4			150
Other losses excluding catastrophe losses	520			467			11
Catastrophe losses	51			103			(50	)
Total losses incurred	$	662		$	648		2
Ratios as a percent of earned premiums:							Pt. Change
Current accident year losses greater than $5 million	1.3		%	2.4		%	(1.1	)
Current accident year losses $1 million - $5 million	2.7			2.5			0.2
Large loss prior accident year reserve development	2.8			1.5			1.3
Total large loss ratio	6.8			6.4			0.4
Losses incurred but not reported	0.8			0.4			0.4
Other losses excluding catastrophe losses	43.4			40.5			2.9
Catastrophe losses	4.2			9.0			(4.8	)
Total loss ratio	55.2		%	56.3		%	(1.1	)

We believe the inherent variability of aggregate loss experience for our portfolio of larger policies is greater than that of our portfolio of smaller policies, and we continue to monitor the variability in addition to general

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inflationary trends in loss costs. Our analysis continues to indicate no unexpected concentration of large losses and case reserve increases by risk category, geographic region, policy inception, agency or field marketing territory. The first-quarter 2018 property casualty total large losses incurred of $81 million, net of reinsurance, were higher than the $77 million quarterly average during full-year 2017 and higher than the $74 million experienced for the first quarter of 2017. The ratio for these large losses was 0.4 percentage points higher compared with last year’s first quarter. We believe results for the three-month period largely reflected normal fluctuations in loss patterns and normal variability in large case reserves for claims above $1 million. Losses by size are discussed in further detail in results of operations by property casualty insurance segment.

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FINANCIAL RESULTS

Consolidated results reflect the operating results of each of our five segments along with the parent company, Cincinnati Re and other activities reported as “Other.” The five segments are:

• Commercial lines property casualty insurance

• Personal lines property casualty insurance

• Excess and surplus lines property casualty insurance

• Life insurance

• Investments

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COMMERCIAL LINES INSURANCE RESULTS

(Dollars in millions)	Three months ended March 31,
	2018			2017			% Change
Earned premiums	$	790		$	781		1
Fee revenues	2			1			100
Total revenues	792			782			1
Loss and loss expenses from:
Current accident year before catastrophe losses	524			478			10
Current accident year catastrophe losses	30			68			(56	)
Prior accident years before catastrophe losses	(28		)	(2		)	nm
Prior accident years catastrophe losses	(7		)	(9		)	22
Loss and loss expenses	519			535			(3	)
Underwriting expenses	258			249			4
Underwriting profit (loss)	$	15		$	(2	)	nm
Ratios as a percent of earned premiums:							Pt. Change
Current accident year before catastrophe losses	66.2		%	61.2		%	5.0
Current accident year catastrophe losses	3.8			8.7			(4.9	)
Prior accident years before catastrophe losses	(3.5		)	(0.3		)	(3.2	)
Prior accident years catastrophe losses	(0.9		)	(1.1		)	0.2
Loss and loss expenses	65.6			68.5			(2.9	)
Underwriting expenses	32.7			31.9			0.8
Combined ratio	98.3		%	100.4		%	(2.1	)
Combined ratio	98.3		%	100.4		%	(2.1	)
Contribution from catastrophe losses and prior years reserve development	(0.6		)	7.3			(7.9	)
Combined ratio before catastrophe losses and prior years reserve development	98.9		%	93.1		%	5.8

Overview

Performance highlights for the commercial lines segment include:

• Premiums – Earned premiums for the commercial lines segment grew during the first three months of 2018. The table below analyzes the primary components of premiums. We continue using predictive analytics tools to improve pricing precision and segmentation while also leveraging our local relationships with agents through the efforts of our teams that work closely with them. We seek to maintain appropriate pricing discipline for both new and renewal business as our agents and underwriters assess account quality to make careful decisions on a case-by-case basis whether to write or renew a policy.

Agency renewal written premiums decreased $1 million during the three months ended March 31, 2018, compared with the same period of 2017. The first-quarter 2018 decrease was largely due to a lower total for policies with annual premiums greater than $250,000 that offset price increases and improving economic conditions. During the first quarter of 2018, our overall standard commercial lines policies continued to average estimated renewal price increases at percentages in the low-single-digit range, similar to the fourth quarter of 2017. We continue to segment commercial lines policies, emphasizing identification and retention of policies we believe have relatively stronger pricing. Conversely, we have been seeking stricter renewal terms and conditions on policies we believe have relatively weaker pricing, in turn retaining fewer of those policies. We measure average changes in commercial lines renewal pricing as the percentage rate of change in renewal premium for the new policy period compared with the premium for the expiring policy period, assuming no change in the level of insured exposures or policy coverage between those periods for the respective policies.

Our average overall commercial lines renewal pricing change includes the impact of flat pricing for certain coverages within package policies written for a three-year term that were in force but did not expire during the period being measured. Therefore, the change in average commercial lines renewal pricing we report reflects

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a blend of three-year policies that did not expire and other policies that did expire during the measurement period. For commercial lines policies that did expire and were then renewed during the first quarter of 2018, we estimate that our average percentage price increase for commercial auto continued in the high-single-digit range. The estimated average percentage price change for our commercial property line of business was an increase in the mid-single-digit range and for commercial casualty it was an increase near the low end of the low-single-digit range. The estimated average percentage price change for workers’ compensation was a decrease in the mid-single-digit range.

Renewal premiums for our commercial casualty and workers’ compensation lines include the results of policy audits that adjust initial premium amounts based on differences between estimated and actual sales or payroll related to a specific policy. Audits completed during the first three months of 2018 contributed $16 million to net written premiums.

New business written premiums for commercial lines increased $1 million during the first three months of 2018, compared with the same period of 2017. Trend analysis for year-over-year comparisons of individual quarters are more difficult to assess for commercial lines new business written premiums, due to inherent variability. That variability is often driven by larger policies with annual premiums greater than $100,000.

Other written premiums include premiums ceded to reinsurers as part of our reinsurance ceded program. For our commercial lines insurance segment, ceded premium totals for the first three months of 2018 exceeded the same period of 2017 by less than $1 million.

Commercial Lines Insurance Premiums

(Dollars in millions)	Three months ended March 31,
	2018			2017			% Change
Agency renewal written premiums	$	771		$	772		0
Agency new business written premiums	104			103			1
Other written premiums	(21		)	(10		)	(110	)
Net written premiums	854			865			(1	)
Unearned premium change	(64		)	(84		)	24
Earned premiums	$	790		$	781		1

• Combined ratio – The commercial lines combined ratio decreased 2.1 percentage points for the first three months of 2018, compared with the same period a year ago, largely due to a decrease in losses from natural catastrophes. The first-quarter 2018 combined ratio also reflected higher noncatastrophe weather-related losses and a higher amount of benefit from favorable reserve development on prior accident years, discussed below.

Catastrophe losses and loss expenses accounted for 2.9 percentage points of the combined ratio for the first three months of 2018, compared with 7.6 percentage points for the same period a year ago. The 10-year annual average for that catastrophe measure through 2017 for the commercial lines segment was 5.2 percentage points, and the five-year annual average was 4.7 percentage points. The first-quarter 2018 ratio for noncatastrophe weather-related losses, at 6.5 percent, was 3.7 percentage points higher than the same period a year ago.

Commercial auto, representing 20 percent of our 2017 commercial lines earned premiums, was the only major line of business in this segment with a first-quarter 2018 total loss and loss expense ratio before catastrophe losses significantly higher than we desired. During the first three months of 2018, our commercial auto policies experienced average renewal price increases at percentages in the high-single-digit range. We believe pricing and risk selection actions we are taking will help improve future profitability. Further segmentation of policies as they renew should also help improve profitability, as we seek more adequate pricing on individual policies that need it based on analytics and underwriter judgment.

The net effect of reserve development on prior accident years during the first three months of 2018 was favorable for commercial lines overall by $35 million compared with $11 million for the same period in 2017. For the first three months of 2018, our commercial property line of business was the largest contributor to the total commercial lines net favorable reserve development on prior accident years, followed by workers' compensation. Those contributions were partially offset by a relatively small amount of unfavorable reserve development for our commercial casualty line of business, primarily due an increase in case reserves for

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accident year 2017. The net favorable reserve development recognized during the first three months of 2018 for our commercial lines insurance segment was largely for accident years prior to 2016, and was primarily due to lower-than-anticipated loss emergence on known claims. Reserve estimates are inherently uncertain as described in our 2017 Annual Report on Form 10-K, Item 7, Critical Accounting Estimates, Property Casualty Insurance Loss and Loss Expense Reserves, Page 49.

The commercial lines underwriting expense ratio for the first quarter of 2018 increased, compared with the same period of 2017, reflecting a lower amount of deferred acquisition costs that was partially offset by higher earned premiums and ongoing expense management efforts.

Commercial Lines Insurance Losses Incurred by Size

(Dollars in millions, net of reinsurance)	Three months ended March 31,
	2018			2017			% Change
Current accident year losses greater than $5 million	$	15		$	28		(46	)
Current accident year losses $1 million - $5 million	22			26			(15	)
Large loss prior accident year reserve development	29			17			71
Total large losses incurred	66			71			(7	)
Losses incurred but not reported	16			(5		)	nm
Other losses excluding catastrophe losses	325			306			6
Catastrophe losses	22			58			(62	)
Total losses incurred	$	429		$	430		0
Ratios as a percent of earned premiums:							Pt. Change
Current accident year losses greater than $5 million	1.9		%	3.6		%	(1.7	)
Current accident year losses $1 million - $5 million	2.9			3.3			(0.4	)
Large loss prior accident year reserve development	3.6			2.2			1.4
Total large loss ratio	8.4			9.1			(0.7	)
Losses incurred but not reported	2.1			(0.6		)	2.7
Other losses excluding catastrophe losses	41.1			39.2			1.9
Catastrophe losses	2.8			7.4			(4.6	)
Total loss ratio	54.4		%	55.1		%	(0.7	)

We continue to monitor new losses and case reserve increases greater than $1 million for trends in factors such as initial reserve levels, loss cost inflation and claim settlement expenses. Our analysis continues to indicate no unexpected concentration of these large losses and case reserve increases by risk category, geographic region, policy inception, agency or field marketing territory. The first-quarter 2018 commercial lines total large losses incurred of $66 million, net of reinsurance, were higher than the quarterly average of $63 million during full-year 2017 but lower than the $71 million total large losses incurred for the first quarter of 2017. The decrease in commercial lines large losses for the first three months of 2018 was largely due to our commercial property and workers' compensation lines of business. The first-quarter 2018 ratio for commercial lines total large losses was 0.7 percentage points lower compared with last year’s first-quarter ratio. We believe results for the three-month period largely reflected normal fluctuations in loss patterns and normal variability in large case reserves for claims above $1 million.

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PERSONAL LINES INSURANCE RESULTS

(Dollars in millions)	Three months ended March 31,
	2018			2017			% Change
Earned premiums	$	325		$	300		8
Fee revenues	1			2			(50	)
Total revenues	326			302			8
Loss and loss expenses from:
Current accident year before catastrophe losses	210			193			9
Current accident year catastrophe losses	29			48			(40	)
Prior accident years before catastrophe losses	(1		)	(9		)	89
Prior accident years catastrophe losses	—			(1		)	100
Loss and loss expenses	238			231			3
Underwriting expenses	97			86			13
Underwriting loss	$	(9	)	$	(15	)	40
Ratios as a percent of earned premiums:							Pt. Change
Current accident year before catastrophe losses	64.5		%	64.1		%	0.4
Current accident year catastrophe losses	9.0			16.0			(7.0	)
Prior accident years before catastrophe losses	(0.1		)	(2.9		)	2.8
Prior accident years catastrophe losses	(0.1		)	(0.4		)	0.3
Loss and loss expenses	73.3			76.8			(3.5	)
Underwriting expenses	29.9			28.7			1.2
Combined ratio	103.2		%	105.5		%	(2.3	)
Combined ratio	103.2		%	105.5		%	(2.3	)
Contribution from catastrophe losses and prior years reserve development	8.8			12.7			(3.9	)
Combined ratio before catastrophe losses and prior years reserve development	94.4		%	92.8		%	1.6

Overview

Performance highlights for the personal lines segment include:

• Premiums – Personal lines earned premiums and net written premiums for the first three months of 2018 continued to grow, reflecting increases in renewal written premiums and new business written premiums from agencies that represent us. Price increases and a high level of policy retention were the main drivers of renewal premium growth. The table below analyzes the primary components of premiums.

Agency renewal written premiums increased 8 percent for the first quarter of 2018, largely reflecting rate increases. We estimate that premium rates for our personal auto line of business increased at average percentages in the high-single-digit range during the first three months of 2018. For our homeowner line of business, we estimate that premium rates for the first three months of 2018 increased at average percentages in the mid-single-digit range. For both our personal auto and homeowner lines of business, some individual policies experienced lower or higher rate changes based on each risk's specific characteristics and enhanced pricing precision enabled by predictive models.

Personal lines new business written premiums grew $5 million or 15 percent during the first quarter of 2018, compared with the same period of 2017, mainly due to an increase of approximately $5 million from high net worth clients of our agencies. Personal lines new business written premiums from our high net worth policies totaled approximately $15 million for the first three months of 2018.

Other written premiums include premiums ceded to reinsurers as part of our reinsurance ceded program. For our personal lines insurance segment, ceded premium totals for the first three months of 2018 were similar to the same period of 2017.

We continue to implement strategies discussed in our 2017 Annual Report on Form 10-K, Item 1, Strategic Initiatives, Page 14, to enhance our responsiveness to marketplace changes and to help achieve our long-term

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objectives for personal lines growth and profitability. These strategies include initiatives to more profitably underwrite personal auto policies.

Personal Lines Insurance Premiums

(Dollars in millions)	Three months ended March 31,
	2018			2017			% Change
Agency renewal written premiums	$	264		$	245		8
Agency new business written premiums	39			34			15
Other written premiums	(6		)	(6		)	0
Net written premiums	297			273			9
Unearned premium change	28			27			4
Earned premiums	$	325		$	300		8

• Combined ratio – Our personal lines combined ratio for the first quarter of 2018 decreased 2.3 percentage points, compared with the same period a year ago, primarily due to a decrease of 6.7 percentage points in the ratio for weather-related natural catastrophe losses and loss expenses. The first-quarter 2018 combined ratio also reflected higher noncatastrophe weather-related losses.

Catastrophe losses and loss expenses accounted for 8.9 percentage points of the combined ratio for the first three months of 2018, compared with 15.6 percentage points for the same period of 2017. The 10-year annual average catastrophe loss ratio through 2017 for the personal lines segment was 11.4 percentage points, and the five-year annual average was 8.6 percentage points. The first-quarter 2018 ratio for noncatastrophe weather-related losses, at 7.4 percent, was 3.6 percentage points higher than the same period a year ago.

In addition to the average rate increases discussed above, we continue to refine our pricing to better match premiums to the risk of loss on individual policies. Improved pricing precision and broad-based rate increases are expected to help position the combined ratio at a profitable level over the long term. In addition, greater geographic diversification is expected to reduce the volatility of homeowner loss ratios attributable to weather-related catastrophe losses over time.

Personal auto, representing 47 percent of our 2017 personal lines earned premiums, was the only major line of business in this segment with a first-quarter 2018 total loss and loss expense ratio before catastrophe losses significantly higher than we desired. As discussed above, during the first three months of 2018, our personal auto policies experienced average renewal price increases at percentages in the high-single-digit range. We believe rate increases and other actions to improve pricing precision and reduce loss costs will improve future profitability.

The net effect of reserve development on prior accident years during the first three months of 2018 was favorable for personal lines overall by $1 million, compared with $10 million for the same period in 2017. Our personal auto line of business was the largest contributor to the first-quarter 2018 total personal lines net favorable reserve development on prior accident years, partially offset by unfavorable reserve development for our homeowner and other personal lines of business. The favorable reserve development was due primarily to lower-than-anticipated loss emergence on known claims. Reserve estimates are inherently uncertain as described in our 2017 Annual Report on Form 10-K, Item 7, Critical Accounting Estimates, Property Casualty Insurance Loss and Loss Expense Reserves, Page 49.

The underwriting expense ratio increased for the first three months of 2018, compared with the same period of 2017, reflecting a lower amount of deferred acquisition costs that was partially offset by higher earned premiums and ongoing expense management efforts.

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Personal Lines Insurance Losses Incurred by Size

(Dollars in millions, net of reinsurance)	Three months ended March 31,
	2018			2017			% Change
Current accident year losses greater than $5 million	$	—		$	—		nm
Current accident year losses $1 million - $5 million	10			3			233
Large loss prior accident year reserve development	5			—			nm
Total large losses incurred	15			3			400
Losses incurred but not reported	(1		)	10			nm
Other losses excluding catastrophe losses	167			144			16
Catastrophe losses	29			46			(37	)
Total losses incurred	$	210		$	203		3
Ratios as a percent of earned premiums:							Pt. Change
Current accident year losses greater than $5 million	—		%	—		%	0.0
Current accident year losses $1 million - $5 million	2.9			1.0			1.9
Large loss prior accident year reserve development	1.7			(0.2		)	1.9
Total large loss ratio	4.6			0.8			3.8
Losses incurred but not reported	(0.4		)	3.3			(3.7	)
Other losses excluding catastrophe losses	51.6			47.9			3.7
Catastrophe losses	8.8			15.5			(6.7	)
Total loss ratio	64.6		%	67.5		%	(2.9	)

We continue to monitor new losses and case reserve increases greater than $1 million for trends in factors such as initial reserve levels, loss cost inflation and claim settlement expenses. Our analysis continues to indicate no unexpected concentration of these large losses and case reserve increases by risk category, geographic region, policy inception, agency or field marketing territory. In the first quarter of 2018, the personal lines total large loss ratio, net of reinsurance, was 3.8 percentage points higher than last year’s first quarter. The rise in personal lines large losses for the first three months of 2018 was largely due to our homeowner line of business. We believe results for the three-month period largely reflected normal fluctuations in loss patterns and normal variability in large case reserves for claims above $1 million.

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EXCESS AND SURPLUS LINES INSURANCE RESULTS

(Dollars in millions)	Three months ended March 31,
	2018			2017			% Change
Earned premiums	$	56		$	48		17
Loss and loss expenses from:
Current accident year before catastrophe losses	30			26			15
Current accident year catastrophe losses	1			1			0
Prior accident years before catastrophe losses	(10		)	(13		)	23
Prior accident years catastrophe losses	—			—			0
Loss and loss expenses	21			14			50
Underwriting expenses	17			16			6
Underwriting profit	$	18		$	18		0
Ratios as a percent of earned premiums:							Pt. Change
Current accident year before catastrophe losses	54.6		%	55.5		%	(0.9	)
Current accident year catastrophe losses	1.8			1.2			0.6
Prior accident years before catastrophe losses	(17.2		)	(27.4		)	10.2
Prior accident years catastrophe losses	0.1			(0.4		)	0.5
Loss and loss expenses	39.3			28.9			10.4
Underwriting expenses	29.5			33.4			(3.9	)
Combined ratio	68.8		%	62.3		%	6.5
Combined ratio	68.8		%	62.3		%	6.5
Contribution from catastrophe losses and prior years reserve development	(15.3		)	(26.6		)	11.3
Combined ratio before catastrophe losses and prior years reserve development	84.1		%	88.9		%	(4.8	)

Overview

Performance highlights for the excess and surplus lines segment include:

• Premiums – Excess and surplus lines net written premiums continued to grow, primarily due to increases in renewal written premiums, during the first three months of 2018.

Renewal written premiums rose 20 percent for the three months ended March 31, 2018, compared with the same period of 2017, reflecting the opportunity to renew many accounts for the first time, as well as higher renewal pricing. For the first three months of 2018, excess and surplus lines policy renewals experienced estimated average price increases at percentages in the low-single-digit range. We measure average changes in excess and surplus lines renewal pricing as the percentage rate of change in renewal premium for the new policy period compared with the premium for the expiring policy period, assuming no change in the level of insured exposures or policy coverage between those periods for respective policies.

New business written premiums produced by agencies increased by less than $1 million for the first three months of 2018, compared with the same period of 2017, as we continued to carefully underwrite each policy in a highly competitive market. Some of what we report as new business came from accounts that were not new to our agents. We believe our agents’ seasoned accounts tend to be priced more accurately than business that may be less familiar to them.

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Excess and Surplus Lines Insurance Premiums

(Dollars in millions)	Three months ended March 31,
	2018			2017			% Change
Agency renewal written premiums	$	48		$	40		20
Agency new business written premiums	16			16			0
Other written premiums	(3		)	(3		)	0
Net written premiums	61			53			15
Unearned premium change	(5		)	(5		)	0
Earned premiums	$	56		$	48		17

• Combined ratio – The excess and surplus lines combined ratio increased by 6.5 percentage points for the first quarter of 2018, compared with the same period of 2017, primarily due to less favorable reserve development on prior accident years.

Excess and surplus lines net favorable reserve development on prior accident years, as a ratio to earned premiums, was 17.1 percent for the first three months of 2018, compared with 27.8 percent for the same period of 2017. Approximately half of the net favorable reserve development recognized during the first three months of 2018 was attributable to accident years 2017 and 2016. The favorable reserve development was due primarily to lower-than-anticipated loss emergence on known claims. Reserve estimates are inherently uncertain as described in our 2017 Annual Report on Form 10-K, Item 7, Critical Accounting Estimates, Property Casualty Insurance Loss and Loss Expense Reserves, Page 49.

The underwriting expense ratio for the first quarter of 2018 improved, compared with the same period of 2017, reflecting higher earned premiums and ongoing expense management efforts.

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Excess and Surplus Lines Insurance Losses Incurred by Size

(Dollars in millions, net of reinsurance)	Three months ended March 31,
	2018			2017			% Change
Current accident year losses greater than $5 million	$	—		$	—		nm
Current accident year losses $1 million - $5 million	—			—			nm
Large loss prior accident year reserve development	—			—			nm
Total large losses incurred	—			—			nm
Losses incurred but not reported	(5		)	(1		)	nm
Other losses excluding catastrophe losses	14			8			75
Catastrophe losses	1			—			nm
Total losses incurred	$	10		$	7		43
Ratios as a percent of earned premiums:							Pt. Change
Current accident year losses greater than $5 million	—		%	—		%	0.0
Current accident year losses $1 million - $5 million	—			—			0.0
Large loss prior accident year reserve development	(0.4		)	(0.3		)	(0.1	)
Total large loss ratio	(0.4		)	(0.3		)	(0.1	)
Losses incurred but not reported	(9.0		)	(1.6		)	(7.4	)
Other losses excluding catastrophe losses	26.4			17.0			9.4
Catastrophe losses	1.8			0.8			1.0
Total loss ratio	18.8		%	15.9		%	2.9

We continue to monitor new losses and case reserve increases greater than $1 million for trends in factors such as initial reserve levels, loss cost inflation and claim settlement expenses. Our analysis continues to indicate no unexpected concentration of these large losses and case reserve increases by risk category, geographic region, policy inception, agency or field marketing territory. In the first quarter of 2018, the excess and surplus lines total ratio for large losses, net of reinsurance, was 0.1 percentage points lower than last year’s first quarter. We believe results for the three-month period largely reflected normal fluctuations in loss patterns and normal variability in large case reserves for claims above $1 million.

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LIFE INSURANCE RESULTS

(Dollars in millions)	Three months ended March 31,
	2018			2017			% Change
Earned premiums	$	60		$	57		5
Fee revenues	1			2			(50	)
Total revenues	61			59			3
Contract holders' benefits incurred	63			65			(3	)
Investment interest credited to contract holders'	(24		)	(23		)	(4	)
Underwriting expenses incurred	20			17			18
Total benefits and expenses	59			59			0
Life insurance segment profit	$	2		$	—		nm

Overview

Performance highlights for the life insurance segment include:

• Revenues – Revenues increased for the three months ended March 31, 2018, primarily due to higher earned premiums from term life insurance, our largest life insurance product line.

Net in-force life insurance policy face amounts increased to $62.147 billion at March 31, 2018, from $61.177 billion at year-end 2017.

Fixed annuity deposits received for the three months ended March 31, 2018, were $7 million compared with $10 million for same period of 2017. Fixed annuity deposits have a minimal impact to earned premiums because deposits received are initially recorded as liabilities. Profit is earned over time by way of interest-rate spreads. We do not write variable or equity-indexed annuities.

Life Insurance Premiums

(Dollars in millions)	Three months ended March 31,
	2018		2017		% Change
Term life insurance	$	41	$	38	8
Universal life insurance	9		10		(10	)
Other life insurance, annuity and disability income products	10		9		11
Net earned premiums	$	60	$	57	5

• Profitability – Our life insurance segment typically reports a small profit or loss on a GAAP basis because profits from investment income spreads are included in our investment segment results. We include only investment income credited to contract holders (including interest assumed in life insurance policy reserve calculations) in our life insurance segment results. A gain of $2 million for our life insurance segment in the first three months of 2018, compared with a gain of less than $1 million for the same period of 2017, was largely due to more favorable effects from the unlocking of actuarial assumptions.

Life insurance segment benefits and expenses consist principally of contract holders’ (policyholders’) benefits incurred related to traditional life and interest-sensitive products and operating expenses incurred, net of deferred acquisition costs. Total benefits decreased in the first three months of 2018. The increase in life policy and investment contract reserves during the first three months of 2018 was less than the increase for the same period a year ago. For the first three months of 2018, unlocking of interest rate and other actuarial assumptions decreased life policy and contract reserves. For the first three months of 2017, unlocking increased life policy and contract reserves. Mortality results increased from the same period of 2017 but were less than our 2018 projections.

Underwriting expenses for the first three months of 2018 increased compared with the same period a year ago. For the first three months of 2018, unlocking of interest rate and other actuarial assumptions had an immaterial impact on the amount of expenses deferred to future periods. For the first three months of 2017, unlocking increased the amount of expenses deferred to future periods, decreasing underwriting expenses.

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We recognize that assets under management, capital appreciation and investment income are integral to evaluating the success of the life insurance segment because of the long duration of life products. On a basis that includes investment income and investment gains or losses from life-insurance-related invested assets, the life insurance company reported net income of $13 million for the three months ended March 31, 2018, matching net income for the same period of 2017. The life insurance company portfolio had net after-tax investment gains of less than $1 million for the three months ended March 31, 2018, compared with $3 million of net after-tax investment gains for the three months ended March 31, 2017.

INVESTMENTS RESULTS

Overview

The investments segment contributes investment income and investment gains and losses to results of operations. Investments traditionally are our primary source of pretax and after-tax profits.

Investment Income

Pretax investment income increased 1 percent for the first quarter of 2018, compared with the same period of 2017. Interest income decreased due to the continuing effects of the low interest rate environment that offset net purchases of fixed-maturity securities. Higher dividend income reflected rising dividend rates and net purchases of equity securities.

Investments Results

(Dollars in millions)	Three months ended March 31,
	2018			2017			% Change
Total investment income, net of expenses	$	150		$	149		1
Investment interest credited to contract holders'	(24		)	(23		)	(4	)
Investment gains and losses, net	(191		)	160			nm
Investments profit (loss), pretax	$	(65	)	$	286		nm

We continue to position our portfolio considering both the challenges presented by the current low interest rate environment and the risks presented by potential future inflation. As bonds in our generally laddered portfolio mature or are called over the near term, we will be challenged to replace their current yield. The table below shows the average pretax yield-to-amortized cost associated with expected principal redemptions for our fixed-maturity portfolio. The expected principal redemptions are based on par amounts and include dated maturities, calls and prefunded municipal bonds that we expect will be called during each respective time period.

(Dollars in millions)	% Yield	Principal redemptions
At March 31, 2018
Fixed-maturity pretax yield profile:
Expected to mature during the remainder of 2018	5.54	$	525
Expected to mature during 2019	6.03	660
Expected to mature during 2020	4.75	665
Average yield and total expected redemptions from the remainder of 2018 through 2020	5.43	$	1,850

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The table below shows the average pretax yield-to-amortized cost for fixed-maturity securities acquired during the periods indicated. The average yield for total fixed-maturity securities acquired during the first three months of 2018 was lower than the 4.40 percent average yield-to-amortized cost of the fixed-maturity securities portfolio at the end of 2017. Our fixed-maturity portfolio's average yield of 4.26 percent for the first three months of 2018, from the investment income table below, was also lower than that yield for the year-end 2017 fixed-maturities portfolio.

	Three months ended March 31,
	2018		2017
Average pretax yield-to-amortized cost on new fixed-maturities:
Acquired taxable fixed-maturities	4.11	%	4.38	%
Acquired tax-exempt fixed-maturities	3.32		3.46
Average total fixed-maturities acquired	4.02		3.93

While our bond portfolio more than covers our insurance reserve liabilities, we believe our diversified common stock portfolio of mainly blue chip, dividend-paying companies represents one of our best investment opportunities for the long term. In our 2017 Annual Report on Form 10-K, Item 1, Investments Segment, Page 24, and Item 7, Investments Outlook, Page 86, we discussed our portfolio strategies. We discuss risks related to our investment income and our fixed-maturity and equity investment portfolios in this quarterly report Item 3, Quantitative and Qualitative Disclosures About Market Risk.

The table below provides details about investment income. Average yields in this table are based on the average invested asset and cash amounts indicated in the table, using fixed-maturity securities valued at amortized cost and all other securities at fair value.

(Dollars in millions)	Three months ended March 31,
	2018			2017			% Change
Investment income:
Interest	$	110		$	111		(1	)
Dividends	42			39			8
Other	1			1			0
Less investment expenses	3			2			50
Investment income, pretax	150			149			1
Less income taxes	23			35			(34	)
Total investment income, after-tax	$	127		$	114		11
Investment returns:
Average invested assets plus cash and cash equivalents	$	17,242		$	16,141
Average yield pretax	3.48		%	3.69		%
Average yield after-tax	2.95			2.83
Effective tax rate	15.4			23.6
Fixed-maturity returns:
Average amortized cost	$	10,339		$	9,890
Average yield pretax	4.26		%	4.49		%
Average yield after-tax	3.56			3.28
Effective tax rate	16.3			27.0

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Total Investment Gains and Losses

We believe it is useful to analyze our overall investment performance by using total investment return over several years. Total investment return considers changes in unrealized gains and losses, which are not included in net income, in addition to net investment income and investment gains and losses that are included in net income. Measuring total investment gains and losses is useful for evaluating major components of changes in book value and the value creation ratio that are not included in net income before investment gains.

Investment gains and losses are recognized on the sales of investments, on certain changes in fair values of securities even though we continue to hold the securities or as otherwise required by GAAP. New accounting requirements adopted during first-quarter 2018 resulted in reporting, through net income, the change in fair value for equity securities still held, as disclosed in this quarterly report Item 1, Note 1, Accounting Policies, and Note 2, Investments. Included in net investment gains and losses for the first three months of 2018 was $198 million from the recognition of fair value changes of equity securities still held that prior to 2018 would have been reported in other comprehensive income instead of net income. Change in unrealized gain or losses for fixed-maturity securities are included as a component of other comprehensive income (OCI). Accounting requirements for other-than-temporary impairment (OTTI) charges for the fixed-maturity portfolio are disclosed in our 2017 Annual Report on Form 10-K, Item 8, Note 1, Summary of Significant Accounting Policies, Page 121.

The table below summarizes total investment gains and losses, before taxes.

(Dollars in millions)	Three months ended March 31,
	2018			2017
Investment gains and losses:
Equity securities:
Investment gains and losses on securities sold, net	$	3		$	—
Unrealized investment gains and losses on securities still held, net	(198		)	—
Gross realized gains	—			153
Gross realized losses	—			(4		)
Subtotal	(195		)	149
Fixed maturities:
Gross realized gains	4			10
Gross realized losses	—			—
Subtotal	4			10
Other	—			1
Total investment gains and losses reported in net income	(191		)	160
Change in unrealized investment gains and losses:
Equity Securities	—			97
Fixed Maturities	(221		)	34
Total unrealized investment gains and losses reported in OCI	(221		)	131
Total	$	(412	)	$	291

Of the 3,499 fixed-maturity securities in the portfolio, one security was trading below 70 percent of amortized cost at March 31, 2018. This fixed-maturity security had a fair value of $2 million with an unrealized loss of $1 million. Our asset impairment committee regularly monitors the portfolio, including a quarterly review of the entire portfolio for potential OTTI charges. We believe that if liquidity in the markets were to significantly deteriorate or economic conditions were to significantly weaken, we could experience declines in portfolio values and possibly additional OTTI charges.

We had no OTTI charges for either the first three months of 2018 or the first three months of 2017.

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OTHER

We report as Other the noninvestment operations of the parent company and a noninsurance subsidiary, CFC Investment Company. We also report as Other the underwriting results of Cincinnati Re, our reinsurance assumed operation, including earned premiums, loss and loss expenses and underwriting expenses.

Total revenues for the first three months of 2018 for our Other operations increased, compared with the same period of 2017, primarily due to earned premiums from Cincinnati Re. Total expenses for Other also increased for the first three months of 2018, primarily due to losses and loss expenses and underwriting expenses from Cincinnati Re.

Other loss in the table below represents losses before income taxes. The net result of Cincinnati Re for the first three months of 2018 was an underwriting profit of approximately $5 million. For both periods shown, Other loss resulted largely from interest expense from debt of the parent company.

(Dollars in millions)	Three months ended March 31,
	2018			2017			% Change
Interest and fees on loans and leases	$	1		$	1		0
Earned premiums	29			22			32
Total revenues	30			23			30
Interest expense	13			13			0
Loss and loss expenses	13			8			63
Underwriting expenses	11			9			22
Operating expenses	4			4			0
Total expenses	41			34			21
Other loss	$	(11	)	$	(11	)	0

TAXES

We had $19 million of income tax benefit for the three months ended March 31, 2018, compared with $75 million of income tax expense for the same period of 2017. The effective tax rate for the three months ended March 31, 2018, was 38.0 percent compared with 27.2 percent for the same period last year. The change in our effective tax rate includes the change in the federal tax rate from 35 percent to 21 percent. However, our increase in effective tax rate is primarily due to large unrealized losses included in income for the current period versus only net realized gains included in income for the prior period, combined with immaterial changes in the amount of permanent book-tax differences between the two periods. In both periods, permanent book-tax differences such as tax-exempt interest lowered the effective tax rate, to a smaller positive rate in 2017 and a larger negative rate in 2018.

Historically, we have pursued a strategy of investing some portion of cash flow in tax-advantaged fixed-maturity and equity securities to minimize our overall tax liability and maximize after-tax earnings. See Tax-Exempt Fixed Maturities in this quarterly report Item 3, Quantitative and Qualitative Disclosures About Market Risk for further discussion on municipal bond purchases in our fixed-maturity investment portfolio. For our property casualty insurance subsidiaries, approximately 75 percent of interest from tax-advantaged fixed-maturity investments and approximately 40 percent of dividends from qualified equities are exempt from federal tax after applying proration from the 1986 Tax Reform Act. Our noninsurance companies own an immaterial amount of tax-advantaged fixed-maturity investments. For our noninsurance companies, the dividend received deduction exempts 50 percent of dividends from qualified equities. Our life insurance company does not own tax-advantaged fixed-maturity investments or equities subject to the dividend received deduction. Details about our effective tax rate are in this quarterly report Item 1, Note 9 – Income Taxes.

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LIQUIDITY AND CAPITAL RESOURCES

At March 31, 2018, shareholders’ equity was $7.946 billion, compared with $8.243 billion at December 31, 2017. Total debt was $811 million at March 31, 2018, matching December 31, 2017. At March 31, 2018, cash and cash equivalents totaled $604 million, compared with $657 million at December 31, 2017.

SOURCES OF LIQUIDITY

Subsidiary Dividends

Our lead insurance subsidiary declared dividends of $100 million to the parent company in the first three months of 2018, compared with $90 million for the same period of 2017. For full-year 2017, subsidiary dividends declared totaled $465 million. State of Ohio regulatory requirements restrict the dividends our insurance subsidiary can pay. For full-year 2018, total dividends that our insurance subsidiary could pay to our parent company without regulatory approval are approximately $509 million.

Investing Activities

Investment income is a source of liquidity for both the parent company and its insurance subsidiary. We continue to focus on portfolio strategies to balance near-term income generation and long-term book value growth.

Parent company obligations can be funded with income on investments held at the parent-company level or through sales of securities in that portfolio, although our investment philosophy seeks to compound cash flows over the long term. These sources of capital can help minimize subsidiary dividends to the parent company, protecting insurance subsidiary capital.

See our 2017 Annual Report on Form 10-K, Item 1, Investments Segment, Page 24, for a discussion of our historic investment strategy, portfolio allocation and quality.

Insurance Underwriting

Our property casualty and life insurance underwriting operations provide liquidity because we generally receive premiums before paying losses under the policies purchased with those premiums. After satisfying our cash requirements, we use excess cash flows for investment, increasing future investment income.

Historically, cash receipts from property casualty and life insurance premiums, along with investment income, have been more than sufficient to pay claims, operating expenses and dividends to the parent company.

The table below shows a summary of operating cash flow for property casualty insurance (direct method):

(Dollars in millions)	Three months ended March 31,
	2018			2017			% Change
Premiums collected	$	1,269		$	1,241		2
Loss and loss expenses paid	(714		)	(694		)	(3	)
Commissions and other underwriting expenses paid	(519		)	(497		)	(4	)
Cash flow from underwriting	36			50			(28	)
Investment income received	108			105			3
Cash flow from operations	$	144		$	155		(7	)

Collected premiums for property casualty insurance rose $28 million during the first three months of 2018, compared with the same period in 2017. Loss and loss expenses paid increased $20 million. Commissions and other underwriting expenses paid rose $22 million, primarily due to higher commissions paid to agencies, reflecting the increase in collected premiums.

We discuss our future obligations for claims payments and for underwriting expenses in our 2017 Annual Report on Form 10-K, Item 7, Contractual Obligations, Page 92, and Other Commitments also on Page 92.

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Capital Resources

At March 31, 2018, our debt-to-total-capital ratio was 9.3 percent, with $787 million in long-term debt and $24 million in borrowing on our revolving short-term line of credit. That line of credit also had a $24 million balance at December 31, 2017. At March 31, 2018, $201 million was available for future cash management needs. Based on our capital requirements at March 31, 2018, we do not anticipate a material increase in debt levels during the remainder of 2018. As a result, we expect changes in our debt-to-total-capital ratio to continue to be largely a function of the contribution of unrealized investment gains or losses to shareholders’ equity.

We provide details of our three, long-term notes in this quarterly report Item 1, Note 3 – Fair Value Measurements. None of the notes are encumbered by rating triggers.

Four independent ratings firms award insurer financial strength ratings to our property casualty insurance companies and three firms rate our life insurance company. Those firms made no changes to our parent company debt ratings during the first three months of 2018. Our debt ratings are discussed in our 2017 Annual Report on Form 10-K, Item 7, Liquidity and Capital Resources, Other Sources of Liquidity, Page 90.

Off-Balance Sheet Arrangements

We do not use any special-purpose financing vehicles or have any undisclosed off-balance sheet arrangements (as that term is defined in applicable SEC rules) that are reasonably likely to have a current or future material effect on the company’s financial condition, results of operation, liquidity, capital expenditures or capital resources. Similarly, the company holds no fair-value contracts for which a lack of marketplace quotations would necessitate the use of fair-value techniques.

USES OF LIQUIDITY

Our parent company and insurance subsidiary have contractual obligations and other commitments. In addition, one of our primary uses of cash is to enhance shareholder return.

Contractual Obligations

In our 2017 Annual Report on Form 10-K, Item 7, Contractual Obligations, Page 92, we estimated our future contractual obligations as of December 31, 2017. There have been no material changes to our estimates of future contractual obligations since our 2017 Annual Report on Form 10-K.

Other Commitments

In addition to our contractual obligations, we have other property casualty operational commitments.

• Commissions – Commissions paid were $327 million in the first three months of 2018. Commission payments generally track with written premiums, except for annual profit-sharing commissions typically paid during the first quarter of the year.

• Other underwriting expenses – Many of our underwriting expenses are not contractual obligations, but reflect the ongoing expenses of our business. Noncommission underwriting expenses paid were $192 million in the first three months of 2018.

• Technology costs – In addition to contractual obligations for hardware and software, we anticipate capitalizing up to $6 million in spending for key technology initiatives in 2018. Capitalized development costs related to key technology initiatives were $1 million in the first three months of 2018. These activities are conducted at our discretion, and we have no material contractual obligations for activities planned as part of these projects.

We contributed $5 million to our qualified pension plan during the first three months of 2018.

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Investing Activities

After fulfilling operating requirements, we invest cash flows from underwriting, investment and other corporate activities in fixed-maturity and equity securities on an ongoing basis to help achieve our portfolio objectives. We discuss our investment strategy and certain portfolio attributes in this quarterly report Item 3, Quantitative and Qualitative Disclosures About Market Risk.

Uses of Capital

Uses of cash to enhance shareholder return include dividends to shareholders. In January 2018, the board of directors declared regular quarterly cash dividends of 53 cents per share for an indicated annual rate of $2.12 per share. During the first three months of 2018, we used $80 million to pay cash dividends to shareholders.

PROPERTY CASUALTY INSURANCE LOSS AND LOSS EXPENSE RESERVES

For the business lines in the commercial and personal lines insurance segments, and in total for the excess and surplus lines segment, the following table details gross reserves among case, IBNR (incurred but not reported) and loss expense reserves, net of salvage and subrogation reserves. Reserving practices are discussed in our 2017 Annual Report on Form 10-K, Item 7, Property Casualty Insurance Loss and Loss Expense Obligations and Reserves, Page 93.

Total gross reserves at March 31, 2018, increased $74 million compared with December 31, 2017. Case loss reserves for losses increased $71 million, IBNR loss reserves increased by $9 million and loss expense reserves decreased by $6 million. Accounting for most of the total gross increase was the aggregate of our commercial casualty, homeowner and commercial auto lines of business.

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Property Casualty Gross Reserves

(Dollars in millions)	Loss reserves					Loss expense reserves		Total gross reserves
	Case reserves		IBNR reserves							Percent of total
At March 31, 2018
Commercial lines insurance:
Commercial casualty	$	913	$	620		$	576	$	2,109	39.9	%
Commercial property	246		22			52		320		6.0
Commercial auto	400		129			127		656		12.4
Workers' compensation	394		529			92		1,015		19.2
Other commercial	108		12			62		182		3.4
Subtotal	2,061		1,312			909		4,282		80.9
Personal lines insurance:
Personal auto	241		38			68		347		6.6
Homeowner	124		(1		)	33		156		2.9
Other personal	54		47			4		105		2.0
Subtotal	419		84			105		608		11.5
Excess and surplus lines	111		82			78		271		5.1
Cincinnati Re	24		106			2		132		2.5
Total	$	2,615	$	1,584		$	1,094	$	5,293	100.0	%
At December 31, 2017
Commercial lines insurance:
Commercial casualty	$	890	$	611		$	570	$	2,071	39.7	%
Commercial property	232		18			65		315		6.0
Commercial auto	401		119			125		645		12.4
Workers' compensation	393		533			96		1,022		19.6
Other commercial	108		14			61		183		3.5
Subtotal	2,024		1,295			917		4,236		81.2
Personal lines insurance:
Personal auto	240		35			70		345		6.6
Homeowner	101		2			33		136		2.6
Other personal	55		46			5		106		2.0
Subtotal	396		83			108		587		11.2
Excess and surplus lines	104		87			73		264		5.1
Cincinnati Re	20		110			2		132		2.5
Total	$	2,544	$	1,575		$	1,100	$	5,219	100.0	%

LIFE POLICY AND INVESTMENT CONTRACT RESERVES

Gross life policy and investment contract reserves were $2.740 billion at March 31, 2018, compared with $2.729 billion at year-end 2017, reflecting continued growth in life insurance policies in force. We discuss our life insurance reserving practices in our 2017 Annual Report on Form 10-K, Item 7, Life Insurance Policyholder Obligations and Reserves, Page 99.

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OTHER MATTERS

SIGNIFICANT ACCOUNTING POLICIES

Our significant accounting policies are discussed in our 2017 Annual Report on Form 10-K, Item 8, Note 1, Summary of Significant Accounting Policies, Page 121, and updated in this quarterly report Item 1, Note 1, Accounting Policies.

In conjunction with those discussions, in the Management’s Discussion and Analysis in the 2017 Annual Report on Form 10-K, management reviewed the estimates and assumptions used to develop reported amounts related to the most significant policies. Management discussed the development and selection of those accounting estimates with the audit committee of the board of directors.

Item 3.    Quantitative and Qualitative Disclosures About Market Risk

Our greatest exposure to market risk is through our investment portfolio. Market risk is the potential for a decrease in securities’ fair value resulting from broad yet uncontrollable forces such as: inflation, economic growth or recession, interest rates, world political conditions or other widespread unpredictable events. It is comprised of many individual risks that, when combined, create a macroeconomic impact.

Our view of potential risks and our sensitivity to such risks is discussed in our 2017 Annual Report on Form 10-K, Item 7A, Quantitative and Qualitative Disclosures About Market Risk, Page 106.

The fair value of our investment portfolio was $16.614 billion at March 31, 2018, down $334 million from year-end 2017, including a $171 million decrease in the fixed-maturity portfolio and a $163 million decrease in the equity portfolio.

(Dollars in millions)	At March 31, 2018								At December 31, 2017
	Cost or  adjusted cost		Percent  of total		Fair value		Percent  of total		Cost or  adjusted cost		Percent  of total		Fair value		Percent  of total
Taxable fixed maturities	$	6,467	47.8	%	$	6,595	39.7	%	$	6,383	47.6	%	$	6,637	39.2	%
Tax-exempt fixed maturities	3,897		28.8		3,933		23.7		3,931		29.3		4,062		24.0
Common equity securities	2,997		22.1		5,893		35.5		2,918		21.8		6,039		35.6
Nonredeemable preferred   equity securities	172		1.3		193		1.1		176		1.3		210		1.2
Total	$	13,533	100.0	%	$	16,614	100.0	%	$	13,408	100.0	%	$	16,948	100.0	%

At March 31, 2018, our consolidated investment portfolio included $5 million of assets for which values are based on prices or valuation techniques that require significant management judgment (Level 3 assets). This represented less than 1 percent of investment portfolio assets measured at fair value. See Item 1, Note 3, Fair Value Measurements, for additional discussion of our valuation techniques. We have generally obtained and evaluated two nonbinding quotes from brokers; then, our investment professionals determined our best estimate of fair value. These investments include private placements, small issues and various thinly traded securities.

In addition to our investment portfolio, the total investments amount reported in our condensed consolidated balance sheets includes Other invested assets. Other invested assets included $31 million of life policy loans, $40 million of private equity investments and $36 million of real estate through direct property ownership and development projects in the United States at March 31, 2018.

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FIXED-MATURITY SECURITIES INVESTMENTS

By maintaining a well-diversified fixed-maturity portfolio, we attempt to reduce overall risk. We invest new money in the bond market on a regular basis, targeting what we believe to be optimal risk-adjusted, after-tax yields. Risk, in this context, includes interest rate, call, reinvestment rate, credit and liquidity risk. We do not make a concerted effort to alter duration on a portfolio basis in response to anticipated movements in interest rates. By regularly investing in the bond market, we build a broad, diversified portfolio that we believe mitigates the impact of adverse economic factors.

In the first three months of 2018, the decrease in fair value of our fixed-maturity portfolio reflected net purchases of securities that were more than offset by a decrease in net unrealized gains, primarily due to an increase in interest rates and a widening of corporate credit spreads. At March 31, 2018, our fixed-maturity portfolio with an average rating of A2/A was valued at 101.6 percent of its amortized cost, compared with 103.7 percent at December 31, 2017.

At March 31, 2018, our investment-grade and noninvestment-grade fixed-maturity securities represented 87.3 percent and 3.2 percent of the portfolio, respectively. The remaining 9.5 percent represented fixed-maturity securities that were not rated by Moody's or S&P Global Ratings.

Attributes of the fixed-maturity portfolio include:

	At March 31, 2018		At December 31, 2017
Weighted average yield-to-amortized cost	4.27	%	4.40	%
Weighted average maturity	7.7	yrs	7.7	yrs
Effective duration	5.3	yrs	5.2	yrs

We discuss maturities of our fixed-maturity portfolio in our 2017 Annual Report on Form 10-K, Item 8, Note 2, Investments, Page 129, and in this quarterly report Item 2, Investments Results.

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TAXABLE FIXED MATURITIES

Our taxable fixed-maturity portfolio, with a fair value of $6.595 billion at March 31, 2018, included:

(Dollars in millions)	At March 31, 2018		At December 31, 2017
Investment-grade corporate	$	5,239	$	5,252
States, municipalities and political subdivisions	421		403
Noninvestment-grade corporate	333		401
Commercial mortgage-backed	286		286
Government sponsored enterprises	271		254
United States government	35		31
Foreign government	10		10
Total	$	6,595	$	6,637

Our strategy is to buy, and typically hold, fixed-maturity investments to maturity, but we monitor credit profiles and fair value movements when determining holding periods for individual securities. With the exception of United States agency issues that include government-sponsored enterprises, no individual issuer’s securities accounted for more than 1.2 percent of the taxable fixed-maturity portfolio at March 31, 2018. Our investment-grade corporate bonds had an average rating of Baa2 by Moody’s or BBB+ by S&P Global Ratings and represented 79.4 percent of the taxable fixed-maturity portfolio’s fair value at March 31, 2018, compared with 79.1 percent at year-end 2017.

The heaviest concentration in our investment-grade corporate bond portfolio, based on fair value at

March 31, 2018, was the financial sector. It represented 47.4 percent of our investment-grade corporate bond portfolio, compared with 46.6 percent at year-end 2017. No other sector exceeded 10 percent of our investment-grade corporate bond portfolio.

Our taxable fixed-maturity portfolio at March 31, 2018, included $286 million of commercial mortgage-backed securities with an average rating of Aa1/AA.

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TAX-EXEMPT FIXED MATURITIES

At March 31, 2018, we had $3.933 billion of tax-exempt fixed-maturity securities with an average rating of Aa2/AA by Moody’s and S&P Global Ratings. We traditionally have purchased municipal bonds focusing on general obligation and essential services issues, such as water, waste disposal or others. The portfolio is well diversified among approximately 1,450 municipal bond issuers. No single municipal issuer accounted for more than 0.6 percent of the tax-exempt fixed-maturity portfolio at March 31, 2018.

INTEREST RATE SENSITIVITY ANALYSIS

Because of our strong surplus, long-term investment horizon and ability to hold most fixed-maturity investments until maturity, we believe the company is adequately positioned if interest rates were to rise. Although the fair values of our existing holdings may suffer, a higher rate environment would provide the opportunity to invest cash flow in higher-yielding securities, while reducing the likelihood of untimely redemptions of currently callable securities. While higher interest rates would be expected to continue to increase the number of fixed-maturity holdings trading below 100 percent of amortized cost, we believe lower fixed-maturity security values due solely to interest rate changes would not signal a decline in credit quality. We continue to manage the portfolio with an eye toward both meeting current income needs and managing interest rate risk.

Our dynamic financial planning model uses analytical tools to assess market risks. As part of this model, the effective duration of the fixed-maturity portfolio is continually monitored by our investment department to evaluate the theoretical impact of interest rate movements.

The table below summarizes the effect of hypothetical changes in interest rates on the fair value of the fixed-maturity portfolio:

(Dollars in millions)	Effect from interest rate change in basis points
	-200		-100		-		100		200
At March 31, 2018	$	11,642	$	11,088	$	10,528	$	9,959	$	9,416
At December 31, 2017	$	11,803	$	11,249	$	10,699	$	10,133	$	9,589

The effective duration of the fixed-maturity portfolio as of March 31, 2018, was 5.3 years, up from 5.2 years at year-end 2017. The above table is a theoretical presentation showing that an instantaneous, parallel shift in the yield curve of 100 basis points could produce an approximately 5.4 percent change in the fair value of the fixed-maturity portfolio. Generally speaking, the higher a bond is rated, the more directly correlated movements in its fair value are to changes in the general level of interest rates, exclusive of call features. The fair values of average- to lower-rated corporate bonds are additionally influenced by the expansion or contraction of credit spreads.

In our dynamic financial planning model, the selected interest rate change of 100 to 200 basis points represents our view of a shift in rates that is quite possible over a one-year period. The rates modeled should not be considered a prediction of future events as interest rates may be much more volatile in the future. The analysis is not intended to provide a precise forecast of the effect of changes in rates on our results or financial condition, nor does it take into account any actions that we might take to reduce exposure to such risks.

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Page 63

EQUITY INVESTMENTS

Our equity investments, with a fair value totaling $6.086 billion at March 31, 2018, included $5.893 billion of common stock securities of companies generally with strong indications of paying and growing their dividends. Other criteria we evaluate include increasing sales and earnings, proven management and a favorable outlook. We believe our equity investment style is an appropriate long-term strategy. While our long-term financial position would be affected by prolonged changes in the market valuation of our investments, we believe our strong surplus position and cash flow provide a cushion against short-term fluctuations in valuation. Continued payment of cash dividends by the issuers of our common equity holdings can provide a floor to their valuation.

The table below summarizes the effect of hypothetical changes in market prices on fair value of our equity portfolio.

(Dollars in millions)	Effect from market price change in percent
		-30%		-20%		-10%		—		10%		20%		30%
At March 31, 2018		$	4,260	$	4,869	$	5,477	$	6,086	$	6,695	$	7,303	$	7,912
At December 31, 2017		$	4,374	$	4,999	$	5,624	$	6,249	$	6,874	$	7,499	$	8,124

At March 31, 2018, JP Morgan Chase & Co. (NYSE:JPM) was our largest single common stock holding with a fair value of $248 million, or 4.2 percent of our publicly traded common stock portfolio and 1.5 percent of the total investment portfolio. Twenty-eight holdings among eight different sectors each had a fair value greater than $100 million.

Common Stock Portfolio Industry Sector Distribution

	Percent of common stock portfolio
	At March 31, 2018				At December 31, 2017
	Cincinnati  Financial		S&P 500 Industry Weightings		Cincinnati Financial		S&P 500 Industry Weightings
Sector:
Information technology	20.6	%	22.1	%	19.5	%	23.7	%
Financial	17.0		14.4		16.2		14.8
Industrials	13.9		10.1		14.3		10.3
Consumer discretionary	13.2		12.3		13.6		12.2
Healthcare	13.2		13.9		13.2		13.8
Energy	6.9		6.6		7.3		6.1
Consumer staples	5.8		9.3		6.2		8.2
Materials	4.4		2.8		5.6		3.0
Utilities	2.4		3.2		2.1		2.9
Telecomm services	1.6		2.4		1.7		2.1
Real Estate	1.0		2.9		0.3		2.9
Total	100.0	%	100.0	%	100.0	%	100.0	%

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UNREALIZED INVESTMENT GAINS AND LOSSES

With the adoption of ASU 2016-01 on January 1, 2018, we recognized the cumulative unrealized gains on equity securities and will recognize future changes in fair value through net income. For GAAP purposes this eliminated unrealized gains on equity securities. The remaining unrealized gains and losses are related to fixed-maturity securities. At March 31, 2018, unrealized investment gains before taxes for the fixed-maturity portfolio totaled $243 million and unrealized investment losses amounted to $79 million.

The $164 million net unrealized gain position in our fixed-maturity portfolio at March 31, 2018 decreased in the first three months of 2018, primarily due to an increase in interest rates and a widening of corporate credit spreads. The net gain position for our current fixed-maturity holdings will naturally decline over time as individual securities mature. In addition, changes in interest rates can cause rapid, significant changes in fair values of fixed-maturity securities and the net gain position, as discussed in Quantitative and Qualitative Disclosures About Market Risk.

For federal income tax purposes, taxes on gains from appreciated investments generally are not due until securities are sold. We believe that the appreciated value of equity securities, compared with the cost of securities that is generally used as a tax basis, is a useful measure to help evaluate how fair value can change over time. On this basis, the net unrealized investment gains at March 31, 2018, consisted of a net gain position in our equity portfolio of $2.917 billion. Events or factors such as economic growth or recession can affect the fair value of our equity securities. The seven largest contributors to our common stock portfolio net gain position were JP Morgan Chase, Blackrock Inc. (NYSE:BLK), Microsoft Corporation (Nasdaq:MSFT), Apple Inc. (Nasdaq:AAPL), Honeywell International Inc. (NYSE:HON), 3M Company (NYSE:MMM) and AbbVie Inc. (NYSE:ABBV), which had a combined gross unrealized gain position of $1.011 billion.

Unrealized Investment Losses

We expect the number of fixed-maturity securities trading below amortized cost to fluctuate as interest rates rise or fall and credit spreads expand or contract due to prevailing economic conditions. Further, amortized costs for some securities are revised through OTTI recognized in prior periods. At March 31, 2018, 1,108 of the 3,499 fixed-maturity securities we owned had fair values below amortized cost, compared with 440 of the 3,598 securities we owned at year-end 2017. The 1,108 holdings with fair values below cost or amortized cost at March 31, 2018, represented 28.3 percent of the fair value of our fixed-maturity investment portfolio and $79 million in unrealized losses.

• 1,099 of the 1,108 holdings had fair value between 90 percent and 100 percent of amortized cost at

March 31, 2018. These primarily consist of securities whose current valuation is largely the result of interest rate factors. The fair value of these 1,099 securities was $2.954 billion, and they accounted for $74 million in unrealized losses.

• Eight of the 1,108 fixed-maturity holdings had fair value between 70 percent and 90 percent of amortized cost at March 31, 2018. We believe the eight fixed-maturity securities will continue to pay interest and ultimately pay principal upon maturity. The issuers of these eight securities have strong cash flow to service their debt and meet their contractual obligation to make principal payments. The fair value of these securities was $22 million, and they accounted for $4 million in unrealized losses.

• One of the 1,108 fixed-maturity securities had fair value below 70 percent of amortized cost at March 31, 2018. We believe the remaining one fixed-maturity security will continue to pay interest and ultimately pay principal upon maturity. The issuer of this security has strong cash flow to service their debt and meet their contractual obligation to make principal payments. The fair value of this security was $2 million, and they accounted for $1 million in unrealized losses.

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The table below reviews fair values and unrealized losses by investment category and by the overall duration of the securities’ continuous unrealized loss position.

(Dollars in millions)	Less than 12 months				12 months or more				Total
	Fair		Unrealized		Fair		Unrealized		Fair		Unrealized
At March 31, 2018	value		losses		value		losses		value		losses
Fixed maturity securities:
Corporate	$	1,002	$	20	$	253	$	15	$	1,255	$	35
States, municipalities and political subdivisions	1,052		21		256		14		1,308		35
Commercial mortgage-backed securities	81		1		35		1		116		2
Government-sponsored enterprises	131		2		123		4		254		6
Foreign government	10		—		—		—		10		—
United States government	24		1		11		—		35		1
Total	$	2,300	$	45	$	678	$	34	$	2,978	$	79
At December 31, 2017
Fixed maturity securities:
Corporate	$	330	$	4	$	252	$	9	$	582	$	13
States, municipalities and political subdivisions	88		1		264		5		352		6
Commercial mortgage-backed	33		—		36		1		69		1
Government-sponsored enterprises	96		1		124		3		220		4
Foreign government	10		—		—		—		10		—
United States government	23		—		6		—		29		—
Subtotal	580		6		682		18		1,262		24
Equity securities:
Common equities	229		14		—		—		229		14
Subtotal	229		14		—		—		229		14
Total	$	809	$	20	$	682	$	18	$	1,491	$	38

At March 31, 2018, 250 fixed-maturity securities with a total unrealized loss of $34 million had been in an unrealized loss position for 12 months or more. Of that total, one fixed-maturity security with a fair value of $2 million had a fair value below 70 percent of amortized cost and accounted for $1 million in unrealized losses; six fixed-maturity securities with a fair value of $19 million had a fair value from 70 percent to less than 90 percent of amortized cost and accounted for $4 million in unrealized losses; and 243 fixed-maturity securities with a fair value of $657 million had fair values from 90 percent to less than 100 percent of amortized cost and accounted for $29 million in unrealized losses.

At March 31, 2018, applying our invested asset impairment policy, we determined that the total of $34 million, for securities in an unrealized loss position for 12 months or more in the table above, was not other-than-temporarily impaired.

During the first three months of 2018, and during the same period of 2017, no securities were written down through an impairment charge.

During full-year 2017, we wrote down six securities and recorded $9 million in OTTI charges. At December 31, 2017, 249 fixed-maturity investments with a total unrealized loss of $18 million had been in an unrealized loss position for 12 months or more. Of that total, no fixed-maturity investments had fair values below 70 percent of amortized cost. There were no equity security investments in an unrealized loss position for 12 months or more as of December 31, 2017.

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The following table summarizes the investment portfolio by severity of decline:

(Dollars in millions)	Number of issues	Cost or  amortized cost		Fair value		Gross  unrealized  gain (loss)			Gross investment income
At March 31, 2018
Taxable fixed maturities:
Fair valued below 70% of amortized cost	1	$	3	$	2	$	(1	)	$	—
Fair valued at 70% to less than 100% of amortized cost	480	1,824		1,777		(47		)	15
Fair valued at 100% and above of amortized cost	1,021	4,640		4,816		176			59
Investment income on securities sold in current year	—	—		—		—			3
Total	1,502	6,467		6,595		128			77
Tax-exempt fixed maturities:
Fair valued below 70% of amortized cost	—	—		—		—			—
Fair valued at 70% to less than 100% of amortized cost	627	1,230		1,199		(31		)	9
Fair valued at 100% and above of amortized cost	1,370	2,667		2,734		67			23
Investment income on securities sold in current year	—	—		—		—			1
Total	1,997	3,897		3,933		36			33
Fixed-maturities summary:
Fair valued below 70% of cost or amortized cost	1	3		2		(1		)	—
Fair valued at 70% to less than 100% of cost or amortized cost	1,107	3,054		2,976		(78		)	24
Fair valued at 100% and above of cost or amortized cost	2,391	7,307		7,550		243			82
Investment income on securities sold in current year	—	—		—		—			4
Total	3,499	$	10,364	$	10,528	$	164		$	110
At December 31, 2017
Portfolio summary:
Fair valued below 70% of cost or amortized cost	—	$	—	$	—	$	—		$	—
Fair valued at 70% to less than 100% of cost or amortized cost	440	1,529		1,491		(38		)	37
Fair valued at 100% and above of cost or amortized cost	3,158	11,879		15,457		3,578			533
Investment income on securities sold in current year	—	—		—		—			45
Total	3,598	$	13,408	$	16,948	$	3,540		$	615

See our 2017 Annual Report on Form 10-K, Item 7, Critical Accounting Estimates, Asset Impairment, Page 53.

Item 4.        Controls and Procedures

Evaluation of Disclosure Controls and Procedures – The company maintains disclosure controls and procedures (as that term is defined in Rules 13a-15(e) and 15d-15(e) under the Securities Exchange Act of 1934, as amended (Exchange Act)).

Any controls and procedures, no matter how well designed and operated, can provide only reasonable assurance of achieving the desired control objectives. The company’s management, with the participation of the company’s chief executive officer and chief financial officer, has evaluated the effectiveness of the design and operation of the company’s disclosure controls and procedures as of March 31, 2018. Based upon that evaluation, the company’s chief executive officer and chief financial officer concluded that the design and operation of the company’s disclosure controls and procedures provided reasonable assurance that the disclosure controls and procedures are effective to ensure:

• that information required to be disclosed in the company’s reports under the Exchange Act is recorded, processed, summarized and reported within the time periods specified in the Securities and Exchange Commission’s rules and forms, and

Cincinnati Financial Corporation First-Quarter 2018 10-Q

Page 67

• that such information is accumulated and communicated to the company’s management, including its chief executive officer and chief financial officer, as appropriate, to allow timely decisions regarding required disclosures.

Changes in Internal Control over Financial Reporting – During the three months ended March 31, 2018, there were no changes in our internal controls over financial reporting that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

Part II – Other Information

Item 1.    Legal Proceedings

Neither the company nor any of our subsidiaries are involved in any litigation believed to be material other than ordinary, routine litigation incidental to the nature of our business.

Item 1A.    Risk Factors

Our risk factors have not changed materially since they were described in our 2017 Annual Report on Form 10-K filed February 23, 2018.

Item 2.    Unregistered Sales of Equity Securities and Use of Proceeds

We did not sell any of our shares that were not registered under the Securities Act during the first three months of 2018. Our repurchase program was expanded on October 22, 2007, to increase our repurchase authorization to approximately 13 million shares. Our repurchase program does not have an expiration date. On January 26, 2018, an additional 15 million shares were authorized, which expanded our current repurchase program. We have 17,042,065 shares available for purchase under our programs at March 31, 2018.

Period	Total number  of shares  purchased	Average  price paid  per share	Total number of shares  purchased as part of publicly announced plans or programs	Maximum number of shares that may yet be purchased under the plans or programs
January 1-31, 2018	—	—	—	17,242,065
February 1-28, 2018	24,692	72.73	24,692	17,217,373
March 1-31, 2018	175,308	73.86	175,308	17,042,065
Totals	200,000	73.72	200,000

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Page 68

Item 6.    Exhibits

Exhibit No.	Exhibit Description
3.1	Amended and Restated Articles of Incorporation of Cincinnati Financial Corporation (incorporated by reference to the company's Quarterly Report on Form 10-Q for the quarter ended September 30, 2017, Exhibit 3.1)
3.2	Regulations of Cincinnati Financial Corporation, as amended through May 1, 2010 (incorporated by reference to the company’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2010, Exhibit 3.2)
10.1	Amended and Restated Cincinnati Financial Corporation Top Hat Savings Plan dated January 1, 2018 (incorporated by reference to the company's Annual Report on Form 10-K dated February 23, 2018, Exhibit 10.31)
31A	Certification pursuant to Section 302 of the Sarbanes Oxley Act of 2002 – Chief Executive Officer
31B	Certification pursuant to Section 302 of the Sarbanes Oxley Act of 2002 – Chief Financial Officer
32	Certification pursuant to Section 906 of the Sarbanes Oxley Act of 2002
101.INS	XBRL Instance Document
101.SCH	XBRL Taxonomy Extension Schema Document
101.CAL	XBRL Taxonomy Extension Calculation Linkbase Document
101.DEF	XBRL Taxonomy Extension Definition Linkbase Document
101.LAB	XBRL Taxonomy Extension Label Linkbase Document
101.PRE	XBRL Taxonomy Extension Presentation Linkbase Document

Cincinnati Financial Corporation First-Quarter 2018 10-Q

Page 69

SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

CINCINNATI FINANCIAL CORPORATION

Date: April 25, 2018

/S/ Michael J. Sewell

Michael J. Sewell, CPA

Chief Financial Officer, Senior Vice President and Treasurer

(Principal Accounting Officer)

Cincinnati Financial Corporation First-Quarter 2018 10-Q

Page 70

EX-31.A

EXHIBIT 31A

CERTIFICATION PURSUANT TO SECTION 302 OF

THE SARBANES OXLEY ACT OF 2002

I, Steven J. Johnston, certify that:

1. I have reviewed this Quarterly Report on Form 10-Q of Cincinnati Financial Corporation;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a. designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b. designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c. evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d. disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a. all significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b. any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: April 25, 2018

/S/ Steven J. Johnston

Steven J. Johnston, FCAS, MAAA, CFA, CERA

President and Chief Executive Officer

EX-31.B

EXHIBIT 31B

CERTIFICATION PURSUANT TO SECTION 302 OF

THE SARBANES OXLEY ACT OF 2002

I, Michael J. Sewell, certify that:

1. I have reviewed this Quarterly Report on Form 10-Q of Cincinnati Financial Corporation;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a. designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b. designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c. evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d. disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a. all significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b. any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: April 25, 2018

/S/ Michael J. Sewell

Michael J. Sewell, CPA

Chief Financial Officer, Senior Vice President and Treasurer

(Principal Accounting Officer)

EX-32

EXHIBIT 32

CERTIFICATION PURSUANT TO SECTION 302 OF

THE SARBANES OXLEY ACT OF 2002

The certification set forth below is being submitted in connection with this report on Form 10-Q for the purpose of complying with Rule 13a-14(b) or Rule 15d-14(b) of the Exchange Act and Section 1350 of Chapter 63 of Title 18 of the United States Code.

Steven J. Johnston, the chief executive officer, and Michael J. Sewell, the chief financial officer, of Cincinnati Financial Corporation each certifies that, to the best of his knowledge:

1. the report fully complies with the requirements of Section 13(a) or 15(d) of the Exchange Act; and

2. the information contained in the report fairly presents, in all material respects, the financial condition and results of operations of Cincinnati Financial Corporation.

Date: April 25, 2018

/S/ Steven J. Johnston

Steven J. Johnston, FCAS, MAAA, CFA, CERA

President and Chief Executive Officer

/S/ Michael J. Sewell

Michael J. Sewell, CPA

Chief Financial Officer, Senior Vice President and Treasurer

(Principal Accounting Officer)

XML

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2018	Apr. 20, 2018
Document Documentand Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q1
Trading Symbol	CINF
Entity Registrant Name	CINCINNATI FINANCIAL CORP
Entity Central Index Key	0000020286
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		164,145,978

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Condensed Consolidated Balance Sheets - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Investments
Fixed maturities, at fair value (amortized cost: 2018—$10,364; 2017—$10,314)	$ 10,528	$ 10,699
Equity securities, at fair value (cost: 2017—$3,094)	6,086	6,249
Other invested assets	107	103
Total investments	16,721	17,051
Cash and cash equivalents	604	657
Investment income receivable	124	134
Finance receivable	61	61
Premiums receivable	1,626	1,589
Reinsurance recoverable	423	432
Prepaid reinsurance premiums	39	42
Deferred policy acquisition costs	691	670
Land, building and equipment, net, for company use (accumulated depreciation: 2018—$259; 2017—$253)	186	185
Other assets	192	216
Separate accounts	803	806
Total assets	21,470	21,843
Insurance reserves
Loss and loss expense reserves	5,345	5,273
Life policy and investment contract reserves	2,740	2,729
Unearned premiums	2,459	2,404
Other liabilities	672	792
Deferred income tax	652	745
Note payable	24	24
Long-term debt and capital lease obligations	829	827
Separate accounts	803	806
Total liabilities	13,524	13,600
Commitments and contingent liabilities (Note 12)
Shareholders' Equity
Common stock, par value—$2 per share; (authorized: 2018 and 2017—500 million shares; issued: 2018 and 2017—198.3 million shares)	397	397
Paid-in capital	1,258	1,265
Retained earnings	7,565	5,180
Accumulated other comprehensive income	115	2,788
Treasury stock at cost (2018—34.2 million shares and 2017—34.4 million shares)	(1,389)	(1,387)
Total shareholders' equity	7,946	8,243
Total liabilities and shareholders' equity	$ 21,470	$ 21,843

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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) shares in Millions, $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Statement of Financial Position [Abstract]
Fixed maturities, amortized cost	$ 10,364	$ 10,314
Available-for-sale Equity Securities, Amortized Cost Basis	0	3,094
Land, building and equipment, accumulated depreciation	$ 259	$ 253
Common stock, par value	$ 2	$ 2
Common stock, authorized	500.0	500.0
Common stock, issued	198.3	198.3
Common stock, outstanding	198.3	198.3
Treasury stock, shares	34.2	34.4

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Condensed Consolidated Statements of Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Revenues [Abstract]
Earned premiums	$ 1,260	$ 1,208
Investment income, net of expenses	150	149
Investment gains and losses, net	(191)	160
Fee revenues	4	5
Other revenues	1	1
Total revenues	1,224	1,523
Benefits and Expenses
Insurance losses and contract holders' benefits	854	853
Underwriting, acquisition and insurance expenses	403	377
Interest expense	13	13
Other operating expenses	4	4
Total benefits and expenses	1,274	1,247
Income (Loss) Before Income Taxes	(50)	276
Provision (Benefit) for Income Taxes
Current	28	40
Deferred	(47)	35
Total provision (benefit) for income taxes	(19)	75
Net Income (Loss)	$ (31)	$ 201
Per Common Share
Net income (loss)—basic	$ (0.19)	$ 1.22
Net income (loss)—diluted	$ (0.19)	$ 1.21

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Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Net Income (Loss)	$ (31)	$ 201
Change in unrealized gains on investments, net of tax (benefit) of ($46) and $46, respectively	(175)	85
Amortization of pension actuarial loss and prior service cost, net of tax of $0 and $0, respectively	0	1
Change in life deferred acquisition costs, life policy reserves and other, net of tax of $1 and $1, respectively	5	1
Other comprehensive income (loss)	(170)	87
Comprehensive Income (Loss)	$ (201)	$ 288

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Condensed Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Statement of Comprehensive Income [Abstract]
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax	$ (46)	$ 46
Other Comprehensive Income Loss, Pension And Other Postretirement Benefit Plans, Net Actuarial Loss And Prior Service Cost Arising During Period, Tax	0	0
Other Comprehensive Income, Change in Life Deferred Acquisition Costs, Life Policy Reserves and Other, Tax	$ 1	$ 1

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Condensed Consolidated Statements of Shareholders' Equity - USD ($) shares in Millions, $ in Millions	Total	Common equities	Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Income	Treasury Stock
Beginning Balance (Previously Reported) at Dec. 31, 2016				$ 5,037	$ 1,693
Beginning Balance at Dec. 31, 2016		$ 397	$ 1,252	5,037	1,693	$ (1,319)
Share-based awards		0	(18)			17
Share-based compensation			8
Other			1			1
Net Income (Loss)	$ 201			201
Dividends declared				(82)
Other comprehensive income (loss)	87				87
Shares acquired - share repurchase authorization						(15)
Shares acquired - share-based compensation plans						(4)
Ending Balance at Mar. 31, 2017	7,256	$ 397	1,243	5,156	1,780	(1,320)
Beginning Balance (in shares) at Dec. 31, 2016		164.4
Share-based awards (in shares)		0.5
Shares acquired - share repurchase authorization (in shares)		(0.2)
Shares acquired - share-based compensation plans (in shares)		(0.1)
Stock Issued During Period, Shares, Other		0.0
Ending Balance (in shares) at Mar. 31, 2017		164.6
Unrealized gains reclassified to retained earnings for ASU 2016-01, after tax	0
Unrealized gains reclassified to retained earnings for ASU 2016-01, after tax					(2,503)
Beginning Balance (Previously Reported) at Dec. 31, 2017				5,180	2,788
Beginning Balance at Dec. 31, 2017	8,243	$ 397	1,265	7,683	285	(1,387)
Share-based awards		0	(17)			14
Share-based compensation			9
Other			1			1
Net Income (Loss)	(31)			(31)
Dividends declared				(87)
Other comprehensive income (loss)	(170)				(170)
Shares acquired - share repurchase authorization						(15)
Shares acquired - share-based compensation plans						(2)
Ending Balance at Mar. 31, 2018	$ 7,946	$ 397	$ 1,258	7,565	115	$ (1,389)
Beginning Balance (in shares) at Dec. 31, 2017	198.3	163.9
Share-based awards (in shares)		0.4
Shares acquired - share repurchase authorization (in shares)		(0.2)
Shares acquired - share-based compensation plans (in shares)		0.0
Stock Issued During Period, Shares, Other		0.0
Ending Balance (in shares) at Mar. 31, 2018	198.3	164.1
Unrealized gains reclassified to retained earnings for ASU 2016-01, after tax	$ 2,503			$ 2,503	$ (2,503)

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Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Cash Flows From Operating Activities
Net Income (Loss)	$ (31)	$ 201
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	18	14
Investment gains and losses, net	191	(160)
Share-based compensation	9	8
Interest credited to contract holders'	11	13
Deferred income tax expense	(47)	35
Changes in:
Investment income receivable	10	11
Premiums and reinsurance receivable	(26)	(44)
Deferred policy acquisition costs	(10)	(25)
Other assets	(8)	(5)
Loss and loss expense reserves	72	92
Life policy and investment contract reserves	21	25
Unearned premiums	55	70
Other liabilities	(137)	(139)
Current income tax receivable/payable	26	40
Net cash provided by operating activities	154	136
Cash Flows From Investing Activities
Sale of fixed maturities	5	12
Call or maturity of fixed maturities	393	249
Sale of equity securities	104	216
Purchase of fixed maturities	(438)	(403)
Purchase of equity securities	(110)	(313)
Investment in finance receivables	(6)	(5)
Collection of finance receivables	6	6
Investment in buildings and equipment	(3)	(2)
Change in other invested assets, net	(5)	(6)
Net cash used in investing activities	(54)	(246)
Cash Flows From Financing Activities
Payment of cash dividends to shareholders	(80)	(77)
Shares acquired - share repurchase authorization	(15)	(15)
Payments of note payable	0	(3)
Proceeds from stock options exercised	4	6
Contract holders' funds deposited	21	23
Contract holders' funds withdrawn	(46)	(43)
Other	(37)	(15)
Net cash used in financing activities	(153)	(124)
Net change in cash and cash equivalents	(53)	(234)
Cash and cash equivalents at beginning of year	657	777
Cash and cash equivalents at end of period	604	543
Supplemental Disclosures of Cash Flow Information:
Interest paid	0	0
Income taxes paid	0	0
Noncash Activities
Conversion of securities	3	4
Equipment acquired under capital lease obligations	5	3
Cashless exercise of stock options	2	4
Other assets and other liabilities	$ 30	$ 73

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Accounting Policies

3 Months Ended

Mar. 31, 2018

Accounting Policies [Abstract]

Accounting Policies

NOTE 1 — Accounting Policies

The condensed consolidated financial statements include the accounts of Cincinnati Financial Corporation and its consolidated subsidiaries, each of which is wholly owned. These statements are presented in conformity with accounting principles generally accepted in the United States of America (GAAP). All intercompany balances and transactions have been eliminated in consolidation.

The preparation of financial statements in conformity with GAAP requires us to make estimates and assumptions that affect amounts reported in the financial statements and accompanying notes. Our actual results could differ from those estimates. Certain financial information that is normally included in annual financial statements prepared in accordance with GAAP, but that is not required for interim reporting purposes, has been condensed or omitted.

Our March 31, 2018, condensed consolidated financial statements are unaudited. We believe that we have made all adjustments, consisting only of normal recurring accruals, that are necessary for fair presentation. These condensed consolidated financial statements should be read in conjunction with our consolidated financial statements included in our 2017 Annual Report on Form 10-K. The results of operations for interim periods do not necessarily indicate results to be expected for the full year.

Adopted Accounting Updates

ASU 2014-09 Revenue from Contracts with Customers

In May 2014, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) 2014-09, Revenue from Contracts with Customers. ASU 2014-09 requires an entity to recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods and services. Insurance contracts do not fall within the scope of this ASU. The effective date of ASU 2014-09 was for interim and annual reporting periods beginning after December 15, 2017. The company adopted this ASU effective January 1, 2018 and it did not have a material impact on the company's consolidated financial position, cash flows or results of operations.

ASU 2016-01, Financial Instruments - Overall (Subtopic 825-10) - Recognition and Measurement of Financial Assets and Financial Liabilities

In January 2016, the FASB issued ASU 2016-01, Financial Instruments - Overall (Subtopic 825-10) - Recognition and Measurement of Financial Assets and Financial Liabilities. ASU 2016-01 revised the accounting related to the classification and measurement of investments in equity securities and the presentation of certain fair value changes for financial liabilities measured at fair value. The effective date of ASU 2016-01 was for interim and annual reporting periods beginning after December 15, 2017. The company adopted this ASU on January 1, 2018, and applied it prospectively without prior period amounts restated. As a result of the adoption, $2.503 billion of after-tax unrealized gains on equity securities was reclassified on January 1, 2018, from accumulated other comprehensive income to retained earnings. Results of operations were impacted as changes in fair value of equity securities are now reported in net income (loss) instead of reported in other comprehensive income (loss). As a result of the adoption of this ASU, the first quarter 2018 net investment loss of $191 million in the condensed consolidated statements of income included $198 million from the fair value change of equity securities.

ASU 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments

In August 2016, the FASB issued ASU 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments. ASU 2016-15 addresses eight specific cash flow issues with the objective of reducing the existing diversity in practice. The effective date of ASU 2016-15 is for interim and annual reporting periods beginning after December 15, 2017. The company adopted this ASU effective January 1, 2018, and it did not have a material impact on our company's consolidated financial position, cash flows or results of operations.

ASU 2017-07, Compensation - Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost

In March 2017, the FASB issued ASU 2017-07, Compensation - Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Postretirement Benefit Costs. ASU 2017-07 provides guidance on how to present the components of net periodic benefit costs in the income statement for pension plans and other post-retirement benefit plans and allows only the service cost component of net benefit cost to be eligible for capitalization when applicable. The effective date of ASU 2017-07 is for interim and annual reporting periods beginning after December 15, 2017. The company adopted this ASU effective January 1, 2018 and disclosed the line items used in the statements of income to present the service and non-service components of net periodic benefit costs in Note 11, Employee Retirement Benefits, to these consolidated financial statements. The adoption did not have a material impact on our company's consolidated financial position, cash flows or results of operations.

ASU 2017-09, Compensation - Stock Compensation (Topic 718): Scope of Modification Accounting

In May 2017, the FASB issued ASU 2017-09, Compensation - Stock Compensation (Topic 718): Scope of Modification Accounting. ASU 2017-09 clarifies when to account for a change to the terms or conditions of a share based payment award as a modification. Under the new guidance, modification accounting is required only if the fair value, the vesting conditions, or the classification of the award (as equity or liability) changes as a result of the change in terms or conditions. The effective date of ASU 2017-09 was for interim and annual reporting periods, beginning after December 15, 2017, and was applied prospectively. The company adopted this ASU effective January 1, 2018, and it did not have a material impact on our company's consolidated financial position, cash flows or results of operations.

Pending Accounting Updates

ASU 2016-02, Leases (Topic 842)

In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842). The main provision of ASU 2016-02 requires the recognition of lease assets and lease liabilities by lessees for those leases classified as operating leases under previous GAAP. The effective date of ASU 2016-02 is for interim and annual reporting periods beginning after December 15, 2018. The ASU has not yet been adopted; however, it is not expected to have a material impact on our company’s consolidated financial position, cash flows or results of operations.

ASU 2016-13, Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments

In June 2016, the FASB issued ASU 2016-13, Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments. ASU 2016-13 amends previous guidance on the impairment of financial instruments by adding an impairment model that allows an entity to recognize expected credit losses as an allowance rather than impairing as they are incurred. The new guidance is intended to reduce complexity of credit impairment models and result in a more timely recognition of expected credit losses. The effective date of ASU 2016-13 is for interim and annual reporting periods beginning after December 15, 2019. The ASU has not yet been adopted. Management is currently evaluating the impact on our company's consolidated financial position, cash flows or results of operations.

ASU 2017-08, Receivables - Nonrefundable Fees and Other Costs (Subtopic 310-20): Premium Amortization on Purchased Callable Debt Securities

In March 2017, the FASB issued ASU 2017-08, Receivables - Nonrefundable Fees and Other Costs (Subtopic 310-20): Premium Amortization on Purchased Callable Debt Securities. ASU 2017-08 amends guidance on the amortization period of premiums on certain purchased callable debt securities. The amendments shorten the amortization period of premiums on certain purchased callable debt securities to the earliest call date. The amendments should be applied on a modified retrospective basis through a cumulative-effect adjustment to beginning retained earnings. The effective date of ASU 2017-08 is for interim and annual reporting periods beginning after December 15, 2018. The ASU has not yet been adopted; however, it is not expected to have a material impact on our company's consolidated financial position, cash flows or results of operations.

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Investments

3 Months Ended

Mar. 31, 2018

Investments [Abstract]

Investments

Investments

In the first quarter of 2018, we adopted ASU 2016-01, which resulted in changes in the fair value of equity securities still held at March 31, 2018, being reported in net income (loss) instead of being reported in other comprehensive income (loss). See Note 1, Accounting Policies, for additional discussion.

The following table provides cost or amortized cost, gross unrealized gains, gross unrealized losses and fair value for our fixed-maturity and equity securities:

(Dollars in millions)	Cost or amortized cost		Gross unrealized				Fair value
At March 31, 2018			gains		losses
Fixed maturity securities:
Corporate	$	5,452	$	155	$	35	$	5,572
States, municipalities and political subdivisions	4,304		85		35		4,354
Commercial mortgage-backed	285		3		2		286
Government-sponsored enterprises	277		—		6		271
United States government	36		—		1		35
Foreign government	10		—		—		10
Total	10,364		243		79		10,528
At December 31, 2017
Fixed maturity securities:
Corporate	$	5,420	$	246	$	13	$	5,653
States, municipalities and political subdivisions	4,316		155		6		4,465
Commercial mortgage-backed	280		7		1		286
Government-sponsored enterprises	257		1		4		254
United States government	31		—		—		31
Foreign government	10		—		—		10
Subtotal	10,314		409		24		10,699
Equity securities:
Common equities	2,918		3,135		14		6,039
Nonredeemable preferred equities	176		34		—		210
Subtotal	3,094		3,169		14		6,249
Total	$	13,408	$	3,578	$	38	$	16,948

The net unrealized investment gains in our fixed-maturity portfolio at March 31, 2018, are primarily the result of the continued low interest rate environment that increased the fair value of our fixed-maturity portfolio. Our commercial mortgage-backed securities had an average rating of Aa1/AA at March 31, 2018, and December 31, 2017.

At March 31, 2018, JP Morgan Chase & Co. (NYSE:JPM) was our largest single equity holding with a fair value of $248 million, which was 4.2 percent of our publicly traded common equities portfolio and 1.5 percent of the total investment portfolio.

The table below provides fair values and gross unrealized losses by investment category and by the duration of the securities’ continuous unrealized loss positions:

(Dollars in millions)	Less than 12 months				12 months or more				Total
At March 31, 2018	Fair value		Unrealized losses		Fair value		Unrealized losses		Fair value		Unrealized losses
Fixed maturity securities:
Corporate	$	1,002	$	20	$	253	$	15	$	1,255	$	35
States, municipalities and political subdivisions	1,052		21		256		14		1,308		35
Commercial mortgage-backed securities	81		1		35		1		116		2
Government-sponsored enterprises	131		2		123		4		254		6
Foreign government	10		—		—		—		10		—
United States government	24		1		11		—		35		1
Total	$	2,300	$	45	$	678	$	34	$	2,978	$	79
At December 31, 2017
Fixed maturity securities:
Corporate	$	330	$	4	$	252	$	9	$	582	$	13
States, municipalities and political subdivisions	88		1		264		5		352		6
Commercial mortgage-backed	33		—		36		1		69		1
Government-sponsored enterprises	96		1		124		3		220		4
Foreign government	10		—		—		—		10		—
United States government	23		—		6		—		29		—
Subtotal	580		6		682		18		1,262		24
Equity securities:
Common equities	229		14		—		—		229		14
Subtotal	229		14		—		—		229		14
Total	$	809	$	20	$	682	$	18	$	1,491	$	38

Contractual maturity dates for fixed-maturity investments were:

(Dollars in millions)	Amortized cost		Fair value		% of fair value
At March 31, 2018
Maturity dates:
Due in one year or less	$	449	$	457	4.4	%
Due after one year through five years	2,714		2,768		26.3
Due after five years through ten years	3,986		4,046		38.4
Due after ten years	3,215		3,257		30.9
Total	$	10,364	$	10,528	100.0	%

Actual maturities may differ from contractual maturities when there is a right to call or prepay obligations with or without call or prepayment penalties.

The following table provides investment income and investment gains and losses, net:

(Dollars in millions)	Three months ended March 31,
	2018			2017
Investment income:
Interest	$	110		$	111
Dividends	42			39
Other	1			1
Total	153			151
Less investment expenses	3			2
Total	$	150		$	149
Investment gains and losses, net:
Equity securities:
Investment gains and losses on securities sold, net	$	3		$	—
Unrealized gains and losses on securities still held, net	(198		)	—
Gross realized gains	—			153
Gross realized losses	—			(4		)
Subtotal	(195		)	149
Fixed maturities:
Gross realized gains	4			10
Gross realized losses	—			—
Subtotal	4			10
Other	—			1
Total	$	(191	)	$	160

During the three months ended March 31, 2018, there were no fixed-maturity securities other-than-temporarily impaired. During the three months ended March 31, 2017, there were no equity securities and no fixed-maturity securities other-than-temporarily impaired. There were no credit losses on fixed-maturity securities for which a portion of other-than-temporary impairment (OTTI) has been recognized in other comprehensive income (loss) for the three months ended March 31, 2018 and 2017.

At March 31, 2018, 250 fixed-maturity investments with a total unrealized loss of $34 million had been in an unrealized loss position for 12 months or more. Of that total, one fixed-maturity investment had a fair value below 70 percent of amortized cost. At December 31, 2017, 249 fixed-maturity investments with a total unrealized loss of $18 million had been in an unrealized loss position for 12 months or more. Of that total, no fixed-maturity investments had fair values below 70 percent of amortized cost. There were no equity security investments in an unrealized loss position for 12 months or more as of December 31, 2017.

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Fair Value Measurements

3 Months Ended

Mar. 31, 2018

Fair Value Disclosures [Abstract]

Fair Value Measurements

Fair Value Measurements

In accordance with accounting guidance for fair value measurements and disclosures, we categorized our financial instruments, based on the priority of the observable and market-based data for the valuation technique used, into a three-level fair value hierarchy. The fair value hierarchy gives the highest priority to quoted prices with readily available independent data in active markets for identical assets or liabilities (Level 1) and the lowest priority to unobservable market inputs (Level 3). When various inputs for measurement fall within different levels of the fair value hierarchy, the lowest observable input that has a significant impact on fair value measurement is used. Our valuation techniques have not changed from those used at December 31, 2017, and ultimately management determines fair value. See our 2017 Annual Report on Form 10-K, Item 8, Note 3, Fair Value Measurements, Page 132, for information on characteristics and valuation techniques used in determining fair value.

Fair Value Disclosures for Assets

The following tables illustrate the fair value hierarchy for those assets measured at fair value on a recurring basis at March 31, 2018, and December 31, 2017. We do not have any liabilities carried at fair value. There were no transfers between Level 1 and Level 2.

(Dollars in millions)	Quoted prices in active markets for identical assets (Level 1)		Significant other observable inputs (Level 2)		Significant unobservable inputs (Level 3)		Total
At March 31, 2018
Fixed maturities, available for sale:
Corporate	$	—	$	5,571	$	1	$	5,572
States, municipalities and political subdivisions	—		4,350		4		4,354
Commercial mortgage-backed	—		286		—		286
Government-sponsored enterprises	—		271		—		271
United States government	35		—		—		35
Foreign government	—		10		—		10
Subtotal	35		10,488		5		10,528
Common equities	5,893		—		—		5,893
Nonredeemable preferred equities	—		193		—		193
Separate accounts taxable fixed maturities	—		793		—		793
Top Hat savings plan mutual funds and common equity (included in Other assets)	34		—		—		34
Total	$	5,962	$	11,474	$	5	$	17,441
At December 31, 2017
Fixed maturities, available for sale:
Corporate	$	—	$	5,652	$	1	$	5,653
States, municipalities and political subdivisions	—		4,460		5		4,465
Commercial mortgage-backed	—		286		—		286
Government-sponsored enterprises	—		254		—		254
United States government	31		—		—		31
Foreign government	—		10		—		10
Subtotal	31		10,662		6		10,699
Common equities, available for sale	6,039		—		—		6,039
Nonredeemable preferred equities, available for sale	—		210		—		210
Separate accounts taxable fixed maturities	—		795		—		795
Top Hat savings plan mutual funds and common   equity (included in Other assets)	31		—		—		31
Total	$	6,101	$	11,667	$	6	$	17,774

Each financial instrument that was deemed to have significant unobservable inputs when determining valuation is identified in the following tables by security type with a summary of changes in fair value as of March 31, 2018. Total Level 3 assets continue to be less than 1 percent of financial assets measured at fair value in the condensed consolidated balance sheets. Assets presented in the table below were valued based primarily on broker/dealer quotes for which there is a lack of transparency as to inputs used to develop the valuations. Transfers out of Level 3 included situations where a broker quote was used without observable inputs or data that could be corroborated by our pricing vendors in the prior period and significant other observable inputs were identified in the current period. The quantitative detail of these unobservable inputs is neither provided nor reasonably available to us.

The following table provides the change in Level 3 assets for the three months ended March 31:

(Dollars in millions)	Asset fair value measurements using significant unobservable inputs
		Corporate fixed maturities			States, municipalities and political subdivisions fixed maturities			Total
Beginning balance, January 1, 2018		$	1		$	5		$	6
Total gains or losses (realized/unrealized):
Included in net income (loss)		—			—			—
Included in other comprehensive income (loss)		—			(1		)	(1		)
Purchases		—			—			—
Sales		—			—			—
Transfers into Level 3		—			—			—
Transfers out of Level 3		—			—			—
Ending balance, March 31, 2018		$	1		$	4		$	5
Beginning balance, January 1, 2017		$	78		$	—		$	78
Total gains or losses (realized/unrealized):
Included in net income		—			—			—
Included in other comprehensive income		—			—			—
Purchases		—			—			—
Sales		—			—			—
Transfers into Level 3		—			—			—
Transfers out of Level 3		(77		)	—			(77		)
Ending balance, March 31, 2017		$	1		$	—		$	1

With the exception of the above table, additional disclosures for the Level 3 category are not material and therefore not provided.

Fair Value Disclosures for Assets and Liabilities Not Carried at Fair Value

The disclosures below are presented to provide information about the effects of current market conditions on financial instruments that are not reported at fair value in our condensed consolidated financial statements.

This table summarizes the book value and principal amounts of our long-term debt:

(Dollars in millions)				Book value				Principal amount
Interest rate		Year of  issue		March 31,		December 31,		March 31,		December 31,
				2018		2017		2018		2017
6.900	%	1998	Senior debentures, due 2028	$	26	$	26	$	28	$	28
6.920	%	2005	Senior debentures, due 2028	391		391		391		391
6.125	%	2004	Senior notes, due 2034	370		370		374		374
			Total	$	787	$	787	$	793	$	793

The following table shows fair values of our note payable and long-term debt:

(Dollars in millions)	Quoted prices in active markets for identical assets (Level 1)		Significant other observable inputs (Level 2)		Significant unobservable inputs (Level 3)		Total
At March 31, 2018
Note payable	$	—	$	24	$	—	$	24
6.900% senior debentures, due 2028	—		33		—		33
6.920% senior debentures, due 2028	—		490		—		490
6.125% senior notes, due 2034	—		464		—		464
Total	$	—	$	1,011	$	—	$	1,011
At December 31, 2017
Note payable	$	—	$	24	$	—	$	24
6.900% senior debentures, due 2028	—		34		—		34
6.920% senior debentures, due 2028	—		505		—		505
6.125% senior notes, due 2034	—		477		—		477
Total	$	—	$	1,040	$	—	$	1,040

The following table shows the fair value of our life policy loans included in other invested assets:

(Dollars in millions)	Quoted prices in active markets for identical assets (Level 1)		Significant other observable inputs (Level 2)		Significant unobservable inputs (Level 3)		Total
At March 31, 2018
Life policy loans	$	—	$	—	$	40	$	40
At December 31, 2017
Life policy loans	$	—	$	—	$	41	$	41

Outstanding principal and interest for these life policy loans totaled $31 million at March 31, 2018, and December 31, 2017.

The following table shows fair values of our deferred annuities and structured settlements included in life policy and investment contract reserves:

(Dollars in millions)	Quoted prices in active markets for identical assets (Level 1)		Significant other observable inputs (Level 2)		Significant unobservable inputs (Level 3)		Total
At March 31, 2018
Deferred annuities	$	—	$	—	$	788	$	788
Structured settlements	—		200		—		200
Total	$	—	$	200	$	788	$	988
At December 31, 2017
Deferred annuities	$	—	$	—	$	834	$	834
Structured settlements	—		210		—		210
Total	$	—	$	210	$	834	$	1,044

Recorded reserves for the deferred annuities were $821 million and $835 million at March 31, 2018, and December 31, 2017, respectively. Recorded reserves for the structured settlements were $161 million at March 31, 2018, and December 31, 2017.

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Property Casualty Loss and Loss Expenses

3 Months Ended

Mar. 31, 2018

Premiums Written, Net [Abstract]

Property Casualty Loss And Loss Expenses

Property Casualty Loss and Loss Expenses

This table summarizes activity for our consolidated property casualty loss and loss expense reserves:

(Dollars in millions)	Three months ended March 31,
	2018			2017
Gross loss and loss expense reserves, beginning of period	$	5,219		$	5,035
Less reinsurance recoverable	187			298
Net loss and loss expense reserves, beginning of period	5,032			4,737
Net incurred loss and loss expenses related to:
Current accident year	839			826
Prior accident years	(48		)	(38		)
Total incurred	791			788
Net paid loss and loss expenses related to:
Current accident year	195			185
Prior accident years	519			509
Total paid	714			694
Net loss and loss expense reserves, end of period	5,109			4,831
Plus reinsurance recoverable	184			297
Gross loss and loss expense reserves, end of period	$	5,293		$	5,128

We use actuarial methods, models and judgment to estimate, as of a financial statement date, the property casualty loss and loss expense reserves required to pay for and settle all outstanding insured claims, including incurred but not reported (IBNR) claims, as of that date. The actuarial estimate is subject to review and adjustment by an inter-departmental committee that includes actuarial, claims, underwriting, loss prevention and accounting management. This committee is familiar with relevant company and industry business, claims and underwriting trends, as well as general economic and legal trends that could affect future loss and loss expense payments. The amount we will actually have to pay for claims can be highly uncertain. This uncertainty, together with the size of our reserves, makes the loss and loss expense reserves our most significant estimate. The reserve for loss and loss expenses in the condensed consolidated balance sheets also included $52 million at March 31, 2018, and

$49 million at March 31, 2017, for certain life and health loss and loss expense reserves.

For the three months endedMarch 31, 2018, we experienced $48 million of favorable development on prior accident years, including $35 million of favorable development in commercial lines, $1 million of favorable development in personal lines, $10 million of favorable development in excess and surplus lines and $2 million of favorable development in our reinsurance assumed operations. This included $7 million from favorable development of catastrophe losses for the three months endedMarch 31, 2018. For the three months endedMarch 31, 2018, we recognized favorable reserve development of $21 million for the commercial property line, $13 million for the workers' compensation line, $2 million for the commercial auto line and $4 million for the other commercial lines due to reduced uncertainty of prior accident year loss and loss adjustment expense for these lines. For the three months endedMarch 31, 2018, we recognized unfavorable reserve development of $5 million for the commercial casualty line. The unfavorable reserve development for commercial casualty was primarily due to an increase in case reserves for accident year 2017.

For the three months endedMarch 31, 2017, we experienced $38 million of favorable development on prior accident years, including $11 million of favorable development in commercial lines, $10 million of favorable development in personal lines, $13 million of favorable development in excess and surplus lines and $4 million of favorable development in our reinsurance assumed operations. This included $11 million from favorable development of catastrophe losses for the three months endedMarch 31, 2017. For the three months endedMarch 31, 2017, we recognized favorable reserve development of $18 million for the workers' compensation line, $10 million for the commercial property line and $8 million for the other commercial lines due to reduced uncertainty of prior accident year loss and loss adjustment expenses for these lines. For the three months ended March 31, 2017, we recognized unfavorable reserve development of $15 million for the commercial casualty line and $10 million for the commercial auto line. The unfavorable reserve development for commercial casualty reflected higher than usual large loss activity. Commercial auto developed unfavorably due to higher loss cost effects in recent accident years, resulting in an increase of our reserve estimate for claims that have not yet been settled.

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Life Policy and Investment Contract Reserves

3 Months Ended

Mar. 31, 2018

Liability for Future Policy Benefits [Abstract]

Life Policy And Investment Contract Reserves

Life Policy and Investment Contract Reserves

We establish the reserves for traditional life insurance policies based on expected expenses, mortality, morbidity, withdrawal rates, timing of claim presentation and investment yields, including a provision for uncertainty. Once these assumptions are established, they generally are maintained throughout the lives of the contracts. We use both our own experience and industry experience, adjusted for historical trends, in arriving at our assumptions for expected mortality, morbidity and withdrawal rates as well as for expected expenses. We base our assumptions for expected investment income on our own experience adjusted for current economic conditions.

We establish reserves for the company’s deferred annuity, universal life and structured settlement policies equal to the cumulative account balances, which include premium deposits plus credited interest less charges and withdrawals. Some of our universal life policies contain no-lapse guarantee provisions. For these policies, we establish a reserve in addition to the account balance, based on expected no-lapse guarantee benefits and expected policy assessments.

This table summarizes our life policy and investment contract reserves:

(Dollars in millions)	March 31, 2018		December 31, 2017
Life policy reserves:
Ordinary/traditional life	$	1,098	$	1,080
Other	47		47
Subtotal	1,145		1,127
Investment contract reserves:
Deferred annuities	821		835
Universal life	607		601
Structured settlements	161		160
Other	6		6
Subtotal	1,595		1,602
Total life policy and investment contract reserves	$	2,740	$	2,729

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Deferred Acquisition Costs

3 Months Ended

Mar. 31, 2018

Deferred Costs [Abstract]

Deferred Acquisition Costs

Deferred Policy Acquisition Costs

Expenses directly related to successfully acquired insurance policies – primarily commissions, premium taxes and underwriting costs – are deferred and amortized over the terms of the policies. We update our acquisition cost assumptions periodically to reflect actual experience, and we evaluate the costs for recoverability. The table below shows the deferred policy acquisition costs and asset reconciliation.

(Dollars in millions)	Three months ended March 31,
	2018			2017
Property casualty:
Deferred policy acquisition costs asset, beginning of period	$	438		$	408
Capitalized deferred policy acquisition costs	232			226
Amortized deferred policy acquisition costs	(224		)	(206		)
Deferred policy acquisition costs asset, end of period	$	446		$	428
Life:
Deferred policy acquisition costs asset, beginning of period	$	232		$	229
Capitalized deferred policy acquisition costs	13			13
Amortized deferred policy acquisition costs	(10		)	(8		)
Amortized shadow deferred policy acquisition costs	10			(2		)
Deferred policy acquisition costs asset, end of period	$	245		$	232
Consolidated:
Deferred policy acquisition costs asset, beginning of period	$	670		$	637
Capitalized deferred policy acquisition costs	245			239
Amortized deferred policy acquisition costs	(234		)	(214		)
Amortized shadow deferred policy acquisition costs	10			(2		)
Deferred policy acquisition costs asset, end of period	$	691		$	660

No premium deficiencies were recorded in the condensed consolidated statements of income, as the sum of the anticipated loss and loss expenses, policyholder dividends and unamortized deferred acquisition expenses did not exceed the related unearned premiums and anticipated investment income.

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Accumulated Other Comprehensive Income

3 Months Ended

Mar. 31, 2018

Accumulated Other Comprehensive Income [Abstract]

Comprehensive Income (Loss) Note

Accumulated Other Comprehensive Income

Accumulated other comprehensive income (AOCI) includes changes in unrealized gains and losses on investments, changes in pension obligations and changes in life deferred acquisition costs, life policy reserves and other as follows:

(Dollars in millions)	Three months ended March 31,
	2018									2017
	Before tax			Income tax			Net			Before tax			Income tax			Net
Investments:
AOCI, beginning of period	$	3,540		$	733		$	2,807		$	2,625		$	908		$	1,717
Cumulative effect of change in accounting for equity securities as of January 1, 2018	(3,155		)	(652		)	(2,503		)	—			—			—
Adjusted AOCI, beginning of period	385			81			304			2,625			908			1,717
OCI before investment gains recognized in net income	(217		)	(45		)	(172		)	290			102			188
Investment gains recognized in net income	(4		)	(1		)	(3		)	(159		)	(56		)	(103		)
OCI	(221		)	(46		)	(175		)	131			46			85
AOCI, end of period	$	164		$	35		$	129		$	2,756		$	954		$	1,802
Pension obligations:
AOCI, beginning of period	$	(12	)	$	(1	)	$	(11	)	$	(26	)	$	(8	)	$	(18	)
OCI excluding amortization recognized in net income	—			—			—			—			—			—
Amortization recognized in net income	—			—			—			1			—			1
OCI	—			—			—			1			—			1
AOCI, end of period	$	(12	)	$	(1	)	$	(11	)	$	(25	)	$	(8	)	$	(17	)
Life deferred acquisition costs, life policy reserves and other:
AOCI, beginning of period	$	(10	)	$	(2	)	$	(8	)	$	(9	)	$	(3	)	$	(6	)
OCI before realized gains and losses recognized in net   income	6			1			5			3			2			1
Realized gains recognized in net income	—			—			—			(1		)	(1		)	—
OCI	6			1			5			2			1			1
AOCI, end of period	$	(4	)	$	(1	)	$	(3	)	$	(7	)	$	(2	)	$	(5	)
Summary of AOCI:
AOCI, beginning of period	$	3,518		$	730		$	2,788		$	2,590		$	897		$	1,693
Cumulative effect of change in accounting for equity securities as of January 1, 2018	(3,155		)	(652		)	(2,503		)	—			—			—
Adjusted AOCI, beginning of period	363			78			285			2,590			897			1,693
Investments OCI	(221		)	(46		)	(175		)	131			46			85
Pension obligations OCI	—			—			—			1			—			1
Life deferred acquisition costs, life policy reserves and other OCI	6			1			5			2			1			1
Total OCI	(215		)	(45		)	(170		)	134			47			87
AOCI, end of period	$	148		$	33		$	115		$	2,724		$	944		$	1,780

Investment gains and losses, net and life deferred acquisition costs, life policy reserves and other investment gains and losses, net, are recorded in the investment gains and losses, net, line item in the condensed consolidated statements of income. Amortization on pension obligations is recorded in the insurance losses and contract holders' benefits and underwriting, acquisition and insurance expenses in the condensed consolidated statements of income.

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Reinsurance

3 Months Ended

Mar. 31, 2018

Reinsurance Disclosures [Abstract]

Reinsurance

Reinsurance

Primary components of our property casualty reinsurance assumed operations include involuntary and voluntary assumed risks as well as contracts from our reinsurance assumed operations, known as Cincinnati Re. Primary components of our ceded reinsurance include a property per risk treaty, property excess treaty, casualty per occurrence treaty, casualty excess treaty, property catastrophe treaty and catastrophe bonds and retrocessions on our reinsurance assumed operations. Management's decisions about the appropriate level of risk retention are affected by various factors, including changes in our underwriting practices, capacity to retain risks and reinsurance market conditions.

The tables below summarize our consolidated property casualty insurance net written premiums, earned premiums and incurred loss and loss expenses:

(Dollars in millions)	Three months ended March 31,
	2018			2017
Direct written premiums	$	1,247		$	1,226
Assumed written premiums	49			33
Ceded written premiums	(38		)	(28		)
Net written premiums	$	1,258		$	1,231

(Dollars in millions)	Three months ended March 31,
	2018			2017
Direct earned premiums	$	1,207		$	1,163
Assumed earned premiums	33			27
Ceded earned premiums	(40		)	(39		)
Earned premiums	$	1,200		$	1,151

(Dollars in millions)	Three months ended March 31,
	2018			2017
Direct incurred loss and loss expenses	$	781		$	788
Assumed incurred loss and loss expenses	16			15
Ceded incurred loss and loss expenses	(6		)	(15		)
Incurred loss and loss expenses	$	791		$	788

Our life insurance company purchases reinsurance for protection of a portion of the risks that are written. Primary components of our life reinsurance program include individual mortality coverage, aggregate catastrophe and accidental death coverage in excess of certain deductibles.

The tables below summarize our consolidated life insurance earned premiums and contract holders' benefits incurred:

(Dollars in millions)	Three months ended March 31,
	2018			2017
Direct earned premiums	$	77		$	74
Ceded earned premiums	(17		)	(17		)
Earned premiums	$	60		$	57

(Dollars in millions)	Three months ended March 31,
	2018			2017
Direct contract holders' benefits incurred	$	76		$	76
Ceded contract holders' benefits incurred	(13		)	(11		)
Contract holders' benefits incurred	$	63		$	65

The ceded benefits incurred can vary depending on the type of life insurance policy held and the year the policy was issued.

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Income Taxes

3 Months Ended

Mar. 31, 2018

Income Tax Disclosure [Abstract]

Income Taxes

Income Taxes

As of March 31, 2018, and December 31, 2017, we had no liability for unrecognized tax benefits.

The differences between the 21 percent and 35 percent statutory federal income tax rates and our effective income tax rate were as follows:

(Dollars in millions)	Three months ended March 31,
	2018					2017
Tax at statutory rate:	$	(11	)	21.0	%	$	97		35.0	%
Increase (decrease) resulting from:
Tax-exempt income from municipal bonds	(5		)	10.0		(9		)	(3.3	)
Dividend received exclusion	(3		)	6.0		(8		)	(2.9	)
Other	—			1.0		(5		)	(1.6	)
Provision for income taxes	$	(19	)	38.0	%	$	75		27.2	%

The provision for federal income taxes is based upon filing a consolidated income tax return for the company and its subsidiaries.

Our 2017 10-K discusses enactment of the Tax Cuts and Jobs Act (the “Tax Act”) on December 22, 2017, and its impact on our financial results for that period. Interpretive guidance of the Tax Act will be received throughout 2018, and we expect to update our estimates and our disclosure on a quarterly basis as interpretative guidance is received within each quarter that it is received. During the period ended March 31, 2018, the U.S. Treasury Department (the “Treasury”) and the Internal Revenue Service (the ”IRS”) have not issued further clarification or guidance for the items for which our accounting for the Tax Act is incomplete. We expect to complete determination of the effects of the Tax Act on our deferred tax assets and liabilities as part of the annual income tax return filing process.

As of March 31, 2018, we had no operating or capital loss carryforwards.

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Net Income Per Common Share

3 Months Ended

Mar. 31, 2018

Earnings Per Share [Abstract]

Net Income Per Common Share

Basic earnings per share are computed based on the weighted average number of common shares outstanding. Diluted earnings per share are computed based on the weighted average number of common and dilutive potential common shares outstanding using the treasury stock method. The table shows calculations for basic and diluted earnings per share:

(In millions, except per share data)	Three months ended March 31,
	2018			2017
Numerator:
Net income (loss)—basic and diluted	$	(31	)	$	201
Denominator:
Basic weighted-average common shares outstanding	164.0			164.6
Effect of share-based awards:
Stock options	—			1.1
Nonvested shares	—			0.8
Diluted weighted-average shares	164.0			166.5
Earnings per share:
Basic	$	(0.19	)	$	1.22
Diluted	(0.19		)	1.21
Number of anti-dilutive share-based awards	2.8			0.7

In accordance with ASC 260, Earnings per Share, the assumed exercise of share-based awards in 2018 were excluded from the computation of diluted loss per share. See our 2017 Annual Report on Form 10-K, Item 8, Note 17, Share-Based Associate Compensation Plans, Page 161, for information about share-based awards. The above table shows the number of anti-dilutive share-based awards for the three months endedMarch 31, 2018 and 2017. These share-based awards were not included in the computation of net income (loss) per common share (diluted) because their exercise would have anti-dilutive effects.

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Employee Retirement Benefits

3 Months Ended

Mar. 31, 2018

Retirement Benefits [Abstract]

Employee Retirement Benefits

Employee Retirement Benefits

The following summarizes the components of net periodic benefit cost for our qualified and supplemental pension plans:

(Dollars in millions)	Three months ended March 31,
	2018			2017
Service cost	$	3		$	3
Non-service costs (benefit):
Interest cost	3			3
Expected return on plan assets	(5		)	(5		)
Amortization of actuarial loss and prior service cost	—			1
Total non-service benefit	(2		)	(1		)
Net periodic benefit cost	$	1		$	2

See our 2017 Annual Report on Form 10-K, Item 8, Note 13, Employee Retirement Benefits, Page 156, for information on our retirement benefits. Service costs and non-service costs (benefit) are allocated in the same proportion primarily to underwriting, acquisition and insurance expenses line item with the remainder allocated to insurance losses and contract holders' benefits line item on the consolidated statements of income for both 2018 and 2017.

We made matching contributions totaling $6 million to our 401(k) and Top Hat savings plans during the first quarter of 2018 and 2017.

We contributed $5 million to our qualified pension plan during the first three months of 2018.

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Commitments and Contingent Liabilities

3 Months Ended

Mar. 31, 2018

Commitments and Contingencies Disclosure [Abstract]

Commitments And Contingent Liabilities

Commitments and Contingent Liabilities

In the ordinary course of conducting business, the company and its subsidiaries are named as defendants in various legal proceedings. Most of these proceedings are claims litigation involving the company's insurance subsidiaries in which the company is either defending or providing indemnity for third-party claims brought against insureds or litigating first-party coverage claims. The company accounts for such activity through the establishment of unpaid loss and loss expense reserves. We believe that the ultimate liability, if any, with respect to such ordinary-course claims litigation, after consideration of provisions made for potential losses and costs of defense, is immaterial to our consolidated financial condition, results of operations and cash flows.

The company and its subsidiaries also are occasionally involved in other legal and regulatory proceedings, some of which assert claims for substantial amounts. These actions include, among others, putative class actions seeking certification of a state or national class. Such proceedings have alleged, for example, breach of an alleged duty to search national databases to ascertain unreported deaths of insureds under life insurance policies. The company's insurance subsidiaries also are occasionally parties to individual actions in which extra-contractual damages, punitive damages or penalties are sought, such as claims alleging bad faith handling of insurance claims or writing unauthorized coverage or claims alleging discrimination by former or current associates.

On a quarterly basis, we review these outstanding matters. Under current accounting guidance, we establish accruals when it is probable that a loss has been incurred and we can reasonably estimate its potential exposure. The company accounts for such probable and estimable losses, if any, through the establishment of legal expense reserves. Based on our quarterly review, we believe that our accruals for probable and estimable losses are reasonable and that the amounts accrued do not have a material effect on our consolidated financial condition or results of operations. However, if any one or more of these matters results in a judgment against us or settlement for an amount that is significantly greater than the amount accrued, the resulting liability could have a material effect on the company's consolidated results of operations or cash flows. Based on our most recent review, our estimate for any other matters for which the risk of loss is not probable, but more than remote, is immaterial.

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Segment Information

3 Months Ended

Mar. 31, 2018

Segment Reporting [Abstract]

Segment Information

Segment Information

We operate primarily in two industries, property casualty insurance and life insurance. Our chief operating decision maker regularly reviews our reporting segments to make decisions about allocating resources and assessing performance. Our reporting segments are:

• Commercial lines insurance

• Personal lines insurance

• Excess and surplus lines insurance

• Life insurance

• Investments

We report as Other the noninvestment operations of the parent company and its noninsurer subsidiary, CFC Investment Company and Cincinnati Re, our reinsurance assumed operations. See our 2017 Annual Report on Form 10-K, Item 8, Note 18, Segment Information, Page 164, for a description of revenue, income or loss before income taxes and identifiable assets for each of the five segments.

Segment information is summarized in the following table: 

(Dollars in millions)	Three months ended March 31,
	2018			2017
Revenues:
Commercial lines insurance
Commercial casualty	$	265		$	265
Commercial property	228			223
Commercial auto	161			155
Workers' compensation	80			84
Other commercial	56			54
Commercial lines insurance premiums	790			781
Fee revenues	2			1
Total commercial lines insurance	792			782
Personal lines insurance
Personal auto	151			141
Homeowner	136			125
Other personal	38			34
Personal lines insurance premiums	325			300
Fee revenues	1			2
Total personal lines insurance	326			302
Excess and surplus lines insurance	56			48
Life insurance premiums	60			57
Fee revenues	1			2
Total life insurance	61			59
Investments
Investment income, net of expenses	150			149
Investment gains and losses, net	(191		)	160
Total investment revenue	(41		)	309
Other
Cincinnati Re insurance premiums	29			22
Other	1			1
Total other revenues	30			23
Total revenues	$	1,224		$	1,523
Income (loss) before income taxes:
Insurance underwriting results
Commercial lines insurance	$	15		$	(2	)
Personal lines insurance	(9		)	(15		)
Excess and surplus lines insurance	18			18
Life insurance	2			—
Investments	(65		)	286
Other	(11		)	(11		)
Total income (loss) before income taxes	$	(50	)	$	276

Identifiable assets:	March 31, 2018		December 31, 2017
Property casualty insurance	$	2,888	$	2,863
Life insurance	1,418		1,409
Investments	16,748		17,112
Other	416		459
Total	$	21,470	$	21,843

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Accounting Policies Pending Accounting Updates (Policies)

3 Months Ended

Mar. 31, 2018

Accounting Policies [Abstract]

Adopted Accounting Updates and Pending Accounting Updates

Adopted Accounting Updates

ASU 2014-09 Revenue from Contracts with Customers

In May 2014, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) 2014-09, Revenue from Contracts with Customers. ASU 2014-09 requires an entity to recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods and services. Insurance contracts do not fall within the scope of this ASU. The effective date of ASU 2014-09 was for interim and annual reporting periods beginning after December 15, 2017. The company adopted this ASU effective January 1, 2018 and it did not have a material impact on the company's consolidated financial position, cash flows or results of operations.

ASU 2016-01, Financial Instruments - Overall (Subtopic 825-10) - Recognition and Measurement of Financial Assets and Financial Liabilities

In January 2016, the FASB issued ASU 2016-01, Financial Instruments - Overall (Subtopic 825-10) - Recognition and Measurement of Financial Assets and Financial Liabilities. ASU 2016-01 revised the accounting related to the classification and measurement of investments in equity securities and the presentation of certain fair value changes for financial liabilities measured at fair value. The effective date of ASU 2016-01 was for interim and annual reporting periods beginning after December 15, 2017. The company adopted this ASU on January 1, 2018, and applied it prospectively without prior period amounts restated. As a result of the adoption, $2.503 billion of after-tax unrealized gains on equity securities was reclassified on January 1, 2018, from accumulated other comprehensive income to retained earnings. Results of operations were impacted as changes in fair value of equity securities are now reported in net income (loss) instead of reported in other comprehensive income (loss). As a result of the adoption of this ASU, the first quarter 2018 net investment loss of $191 million in the condensed consolidated statements of income included $198 million from the fair value change of equity securities.

ASU 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments

In August 2016, the FASB issued ASU 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments. ASU 2016-15 addresses eight specific cash flow issues with the objective of reducing the existing diversity in practice. The effective date of ASU 2016-15 is for interim and annual reporting periods beginning after December 15, 2017. The company adopted this ASU effective January 1, 2018, and it did not have a material impact on our company's consolidated financial position, cash flows or results of operations.

ASU 2017-07, Compensation - Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost

In March 2017, the FASB issued ASU 2017-07, Compensation - Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Postretirement Benefit Costs. ASU 2017-07 provides guidance on how to present the components of net periodic benefit costs in the income statement for pension plans and other post-retirement benefit plans and allows only the service cost component of net benefit cost to be eligible for capitalization when applicable. The effective date of ASU 2017-07 is for interim and annual reporting periods beginning after December 15, 2017. The company adopted this ASU effective January 1, 2018 and disclosed the line items used in the statements of income to present the service and non-service components of net periodic benefit costs in Note 11, Employee Retirement Benefits, to these consolidated financial statements. The adoption did not have a material impact on our company's consolidated financial position, cash flows or results of operations.

ASU 2017-09, Compensation - Stock Compensation (Topic 718): Scope of Modification Accounting

In May 2017, the FASB issued ASU 2017-09, Compensation - Stock Compensation (Topic 718): Scope of Modification Accounting. ASU 2017-09 clarifies when to account for a change to the terms or conditions of a share based payment award as a modification. Under the new guidance, modification accounting is required only if the fair value, the vesting conditions, or the classification of the award (as equity or liability) changes as a result of the change in terms or conditions. The effective date of ASU 2017-09 was for interim and annual reporting periods, beginning after December 15, 2017, and was applied prospectively. The company adopted this ASU effective January 1, 2018, and it did not have a material impact on our company's consolidated financial position, cash flows or results of operations.

Pending Accounting Updates

ASU 2016-02, Leases (Topic 842)

In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842). The main provision of ASU 2016-02 requires the recognition of lease assets and lease liabilities by lessees for those leases classified as operating leases under previous GAAP. The effective date of ASU 2016-02 is for interim and annual reporting periods beginning after December 15, 2018. The ASU has not yet been adopted; however, it is not expected to have a material impact on our company’s consolidated financial position, cash flows or results of operations.

ASU 2016-13, Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments

In June 2016, the FASB issued ASU 2016-13, Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments. ASU 2016-13 amends previous guidance on the impairment of financial instruments by adding an impairment model that allows an entity to recognize expected credit losses as an allowance rather than impairing as they are incurred. The new guidance is intended to reduce complexity of credit impairment models and result in a more timely recognition of expected credit losses. The effective date of ASU 2016-13 is for interim and annual reporting periods beginning after December 15, 2019. The ASU has not yet been adopted. Management is currently evaluating the impact on our company's consolidated financial position, cash flows or results of operations.

ASU 2017-08, Receivables - Nonrefundable Fees and Other Costs (Subtopic 310-20): Premium Amortization on Purchased Callable Debt Securities

In March 2017, the FASB issued ASU 2017-08, Receivables - Nonrefundable Fees and Other Costs (Subtopic 310-20): Premium Amortization on Purchased Callable Debt Securities. ASU 2017-08 amends guidance on the amortization period of premiums on certain purchased callable debt securities. The amendments shorten the amortization period of premiums on certain purchased callable debt securities to the earliest call date. The amendments should be applied on a modified retrospective basis through a cumulative-effect adjustment to beginning retained earnings. The effective date of ASU 2017-08 is for interim and annual reporting periods beginning after December 15, 2018. The ASU has not yet been adopted; however, it is not expected to have a material impact on our company's consolidated financial position, cash flows or results of operations.

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Investments (Tables)

3 Months Ended

Mar. 31, 2018

Investments [Abstract]

Analysis Of Cost Or Amortized Cost, Gross Unrealized Gains And Losses And Fair Value for Investments

The following table provides cost or amortized cost, gross unrealized gains, gross unrealized losses and fair value for our fixed-maturity and equity securities:

(Dollars in millions)	Cost or amortized cost		Gross unrealized				Fair value
At March 31, 2018			gains		losses
Fixed maturity securities:
Corporate	$	5,452	$	155	$	35	$	5,572
States, municipalities and political subdivisions	4,304		85		35		4,354
Commercial mortgage-backed	285		3		2		286
Government-sponsored enterprises	277		—		6		271
United States government	36		—		1		35
Foreign government	10		—		—		10
Total	10,364		243		79		10,528
At December 31, 2017
Fixed maturity securities:
Corporate	$	5,420	$	246	$	13	$	5,653
States, municipalities and political subdivisions	4,316		155		6		4,465
Commercial mortgage-backed	280		7		1		286
Government-sponsored enterprises	257		1		4		254
United States government	31		—		—		31
Foreign government	10		—		—		10
Subtotal	10,314		409		24		10,699
Equity securities:
Common equities	2,918		3,135		14		6,039
Nonredeemable preferred equities	176		34		—		210
Subtotal	3,094		3,169		14		6,249
Total	$	13,408	$	3,578	$	38	$	16,948

Fair Values And Unrealized Losses by Investment Category And By The Duration Of The Securities' Continuous Unrealized Loss Position

The table below provides fair values and gross unrealized losses by investment category and by the duration of the securities’ continuous unrealized loss positions:

(Dollars in millions)	Less than 12 months				12 months or more				Total
At March 31, 2018	Fair value		Unrealized losses		Fair value		Unrealized losses		Fair value		Unrealized losses
Fixed maturity securities:
Corporate	$	1,002	$	20	$	253	$	15	$	1,255	$	35
States, municipalities and political subdivisions	1,052		21		256		14		1,308		35
Commercial mortgage-backed securities	81		1		35		1		116		2
Government-sponsored enterprises	131		2		123		4		254		6
Foreign government	10		—		—		—		10		—
United States government	24		1		11		—		35		1
Total	$	2,300	$	45	$	678	$	34	$	2,978	$	79
At December 31, 2017
Fixed maturity securities:
Corporate	$	330	$	4	$	252	$	9	$	582	$	13
States, municipalities and political subdivisions	88		1		264		5		352		6
Commercial mortgage-backed	33		—		36		1		69		1
Government-sponsored enterprises	96		1		124		3		220		4
Foreign government	10		—		—		—		10		—
United States government	23		—		6		—		29		—
Subtotal	580		6		682		18		1,262		24
Equity securities:
Common equities	229		14		—		—		229		14
Subtotal	229		14		—		—		229		14
Total	$	809	$	20	$	682	$	18	$	1,491	$	38

Investments Classified by Contractual Maturity Date [Table Text Block]

Contractual maturity dates for fixed-maturity investments were:

(Dollars in millions)	Amortized cost		Fair value		% of fair value
At March 31, 2018
Maturity dates:
Due in one year or less	$	449	$	457	4.4	%
Due after one year through five years	2,714		2,768		26.3
Due after five years through ten years	3,986		4,046		38.4
Due after ten years	3,215		3,257		30.9
Total	$	10,364	$	10,528	100.0	%

Investment Income, Realized Investment Gains And Losses And Change In Unrealized Investment Gains And Losses

The following table provides investment income and investment gains and losses, net:

(Dollars in millions)	Three months ended March 31,
	2018			2017
Investment income:
Interest	$	110		$	111
Dividends	42			39
Other	1			1
Total	153			151
Less investment expenses	3			2
Total	$	150		$	149
Investment gains and losses, net:
Equity securities:
Investment gains and losses on securities sold, net	$	3		$	—
Unrealized gains and losses on securities still held, net	(198		)	—
Gross realized gains	—			153
Gross realized losses	—			(4		)
Subtotal	(195		)	149
Fixed maturities:
Gross realized gains	4			10
Gross realized losses	—			—
Subtotal	4			10
Other	—			1
Total	$	(191	)	$	160

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Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2018

Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]

Fair Value Hierarchy for Assets Measured at Fair Value on a Recurring Basis

The following tables illustrate the fair value hierarchy for those assets measured at fair value on a recurring basis at March 31, 2018, and December 31, 2017. We do not have any liabilities carried at fair value. There were no transfers between Level 1 and Level 2.

(Dollars in millions)	Quoted prices in active markets for identical assets (Level 1)		Significant other observable inputs (Level 2)		Significant unobservable inputs (Level 3)		Total
At March 31, 2018
Fixed maturities, available for sale:
Corporate	$	—	$	5,571	$	1	$	5,572
States, municipalities and political subdivisions	—		4,350		4		4,354
Commercial mortgage-backed	—		286		—		286
Government-sponsored enterprises	—		271		—		271
United States government	35		—		—		35
Foreign government	—		10		—		10
Subtotal	35		10,488		5		10,528
Common equities	5,893		—		—		5,893
Nonredeemable preferred equities	—		193		—		193
Separate accounts taxable fixed maturities	—		793		—		793
Top Hat savings plan mutual funds and common equity (included in Other assets)	34		—		—		34
Total	$	5,962	$	11,474	$	5	$	17,441
At December 31, 2017
Fixed maturities, available for sale:
Corporate	$	—	$	5,652	$	1	$	5,653
States, municipalities and political subdivisions	—		4,460		5		4,465
Commercial mortgage-backed	—		286		—		286
Government-sponsored enterprises	—		254		—		254
United States government	31		—		—		31
Foreign government	—		10		—		10
Subtotal	31		10,662		6		10,699
Common equities, available for sale	6,039		—		—		6,039
Nonredeemable preferred equities, available for sale	—		210		—		210
Separate accounts taxable fixed maturities	—		795		—		795
Top Hat savings plan mutual funds and common   equity (included in Other assets)	31		—		—		31
Total	$	6,101	$	11,667	$	6	$	17,774

Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3)

The following table provides the change in Level 3 assets for the three months ended March 31:

(Dollars in millions)	Asset fair value measurements using significant unobservable inputs
		Corporate fixed maturities			States, municipalities and political subdivisions fixed maturities			Total
Beginning balance, January 1, 2018		$	1		$	5		$	6
Total gains or losses (realized/unrealized):
Included in net income (loss)		—			—			—
Included in other comprehensive income (loss)		—			(1		)	(1		)
Purchases		—			—			—
Sales		—			—			—
Transfers into Level 3		—			—			—
Transfers out of Level 3		—			—			—
Ending balance, March 31, 2018		$	1		$	4		$	5
Beginning balance, January 1, 2017		$	78		$	—		$	78
Total gains or losses (realized/unrealized):
Included in net income		—			—			—
Included in other comprehensive income		—			—			—
Purchases		—			—			—
Sales		—			—			—
Transfers into Level 3		—			—			—
Transfers out of Level 3		(77		)	—			(77		)
Ending balance, March 31, 2017		$	1		$	—		$	1

Schedule of Carrying Values and Estimated Fair Values of Debt Instruments [Table Text Block]

This table summarizes the book value and principal amounts of our long-term debt:

(Dollars in millions)				Book value				Principal amount
Interest rate		Year of  issue		March 31,		December 31,		March 31,		December 31,
				2018		2017		2018		2017
6.900	%	1998	Senior debentures, due 2028	$	26	$	26	$	28	$	28
6.920	%	2005	Senior debentures, due 2028	391		391		391		391
6.125	%	2004	Senior notes, due 2034	370		370		374		374
			Total	$	787	$	787	$	793	$	793

Fair Value of Life Policy Loans

The following table shows the fair value of our life policy loans included in other invested assets:

(Dollars in millions)	Quoted prices in active markets for identical assets (Level 1)		Significant other observable inputs (Level 2)		Significant unobservable inputs (Level 3)		Total
At March 31, 2018
Life policy loans	$	—	$	—	$	40	$	40
At December 31, 2017
Life policy loans	$	—	$	—	$	41	$	41

Debt

Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]

Fair Values of Deferred Annuities, Structured Settlements and Other Items

The following table shows fair values of our note payable and long-term debt:

(Dollars in millions)	Quoted prices in active markets for identical assets (Level 1)		Significant other observable inputs (Level 2)		Significant unobservable inputs (Level 3)		Total
At March 31, 2018
Note payable	$	—	$	24	$	—	$	24
6.900% senior debentures, due 2028	—		33		—		33
6.920% senior debentures, due 2028	—		490		—		490
6.125% senior notes, due 2034	—		464		—		464
Total	$	—	$	1,011	$	—	$	1,011
At December 31, 2017
Note payable	$	—	$	24	$	—	$	24
6.900% senior debentures, due 2028	—		34		—		34
6.920% senior debentures, due 2028	—		505		—		505
6.125% senior notes, due 2034	—		477		—		477
Total	$	—	$	1,040	$	—	$	1,040

Deferred Annuities, Structured Settlements, And Other

Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]

Fair Values of Deferred Annuities, Structured Settlements and Other Items

The following table shows fair values of our deferred annuities and structured settlements included in life policy and investment contract reserves:

(Dollars in millions)	Quoted prices in active markets for identical assets (Level 1)		Significant other observable inputs (Level 2)		Significant unobservable inputs (Level 3)		Total
At March 31, 2018
Deferred annuities	$	—	$	—	$	788	$	788
Structured settlements	—		200		—		200
Total	$	—	$	200	$	788	$	988
At December 31, 2017
Deferred annuities	$	—	$	—	$	834	$	834
Structured settlements	—		210		—		210
Total	$	—	$	210	$	834	$	1,044

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Property Casualty Loss and Loss Expenses (Tables)

3 Months Ended

Mar. 31, 2018

Premiums Written, Net [Abstract]

Consolidated Property Casualty Loss And Loss Expense Reserves

This table summarizes activity for our consolidated property casualty loss and loss expense reserves:

(Dollars in millions)	Three months ended March 31,
	2018			2017
Gross loss and loss expense reserves, beginning of period	$	5,219		$	5,035
Less reinsurance recoverable	187			298
Net loss and loss expense reserves, beginning of period	5,032			4,737
Net incurred loss and loss expenses related to:
Current accident year	839			826
Prior accident years	(48		)	(38		)
Total incurred	791			788
Net paid loss and loss expenses related to:
Current accident year	195			185
Prior accident years	519			509
Total paid	714			694
Net loss and loss expense reserves, end of period	5,109			4,831
Plus reinsurance recoverable	184			297
Gross loss and loss expense reserves, end of period	$	5,293		$	5,128

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Life Policy and Investment Contract Reserves (Tables)

3 Months Ended

Mar. 31, 2018

Liability for Future Policy Benefits [Abstract]

Reserve For Losses Loss Adjustment Expenses Table [Text Block]

This table summarizes our life policy and investment contract reserves:

(Dollars in millions)	March 31, 2018		December 31, 2017
Life policy reserves:
Ordinary/traditional life	$	1,098	$	1,080
Other	47		47
Subtotal	1,145		1,127
Investment contract reserves:
Deferred annuities	821		835
Universal life	607		601
Structured settlements	161		160
Other	6		6
Subtotal	1,595		1,602
Total life policy and investment contract reserves	$	2,740	$	2,729

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Deferred Acquisition Costs (Tables)

3 Months Ended

Mar. 31, 2018

Deferred Costs [Abstract]

Deferred Policy Acquisition Costs And Asset Reconciliation, Including the Amortized Deferred Policy Acquisition Costs

The table below shows the deferred policy acquisition costs and asset reconciliation.

(Dollars in millions)	Three months ended March 31,
	2018			2017
Property casualty:
Deferred policy acquisition costs asset, beginning of period	$	438		$	408
Capitalized deferred policy acquisition costs	232			226
Amortized deferred policy acquisition costs	(224		)	(206		)
Deferred policy acquisition costs asset, end of period	$	446		$	428
Life:
Deferred policy acquisition costs asset, beginning of period	$	232		$	229
Capitalized deferred policy acquisition costs	13			13
Amortized deferred policy acquisition costs	(10		)	(8		)
Amortized shadow deferred policy acquisition costs	10			(2		)
Deferred policy acquisition costs asset, end of period	$	245		$	232
Consolidated:
Deferred policy acquisition costs asset, beginning of period	$	670		$	637
Capitalized deferred policy acquisition costs	245			239
Amortized deferred policy acquisition costs	(234		)	(214		)
Amortized shadow deferred policy acquisition costs	10			(2		)
Deferred policy acquisition costs asset, end of period	$	691		$	660

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Accumulated Other Comprehensive Income (Tables)

3 Months Ended

Mar. 31, 2018

Accumulated Other Comprehensive Income [Abstract]

Schedule of Accumulated Other Comprehensive Income (Loss)

(Dollars in millions)	Three months ended March 31,
	2018									2017
	Before tax			Income tax			Net			Before tax			Income tax			Net
Investments:
AOCI, beginning of period	$	3,540		$	733		$	2,807		$	2,625		$	908		$	1,717
Cumulative effect of change in accounting for equity securities as of January 1, 2018	(3,155		)	(652		)	(2,503		)	—			—			—
Adjusted AOCI, beginning of period	385			81			304			2,625			908			1,717
OCI before investment gains recognized in net income	(217		)	(45		)	(172		)	290			102			188
Investment gains recognized in net income	(4		)	(1		)	(3		)	(159		)	(56		)	(103		)
OCI	(221		)	(46		)	(175		)	131			46			85
AOCI, end of period	$	164		$	35		$	129		$	2,756		$	954		$	1,802
Pension obligations:
AOCI, beginning of period	$	(12	)	$	(1	)	$	(11	)	$	(26	)	$	(8	)	$	(18	)
OCI excluding amortization recognized in net income	—			—			—			—			—			—
Amortization recognized in net income	—			—			—			1			—			1
OCI	—			—			—			1			—			1
AOCI, end of period	$	(12	)	$	(1	)	$	(11	)	$	(25	)	$	(8	)	$	(17	)
Life deferred acquisition costs, life policy reserves and other:
AOCI, beginning of period	$	(10	)	$	(2	)	$	(8	)	$	(9	)	$	(3	)	$	(6	)
OCI before realized gains and losses recognized in net   income	6			1			5			3			2			1
Realized gains recognized in net income	—			—			—			(1		)	(1		)	—
OCI	6			1			5			2			1			1
AOCI, end of period	$	(4	)	$	(1	)	$	(3	)	$	(7	)	$	(2	)	$	(5	)
Summary of AOCI:
AOCI, beginning of period	$	3,518		$	730		$	2,788		$	2,590		$	897		$	1,693
Cumulative effect of change in accounting for equity securities as of January 1, 2018	(3,155		)	(652		)	(2,503		)	—			—			—
Adjusted AOCI, beginning of period	363			78			285			2,590			897			1,693
Investments OCI	(221		)	(46		)	(175		)	131			46			85
Pension obligations OCI	—			—			—			1			—			1
Life deferred acquisition costs, life policy reserves and other OCI	6			1			5			2			1			1
Total OCI	(215		)	(45		)	(170		)	134			47			87
AOCI, end of period	$	148		$	33		$	115		$	2,724		$	944		$	1,780

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Reinsurance (Tables)

3 Months Ended

Mar. 31, 2018

Reinsurance Disclosures [Abstract]

Property Casualty Insurance Premiums Written On Assumed And Ceded Business

The tables below summarize our consolidated property casualty insurance net written premiums, earned premiums and incurred loss and loss expenses:

(Dollars in millions)	Three months ended March 31,
	2018			2017
Direct written premiums	$	1,247		$	1,226
Assumed written premiums	49			33
Ceded written premiums	(38		)	(28		)
Net written premiums	$	1,258		$	1,231

Earned Consolidated Property Casualty Insurance Premiums On Assumed And Ceded Business

(Dollars in millions)	Three months ended March 31,
	2018			2017
Direct earned premiums	$	1,207		$	1,163
Assumed earned premiums	33			27
Ceded earned premiums	(40		)	(39		)
Earned premiums	$	1,200		$	1,151

Incurred Consolidated Property Casualty Insurance Loss And Loss Expenses On Assumed And Ceded Business

(Dollars in millions)	Three months ended March 31,
	2018			2017
Direct incurred loss and loss expenses	$	781		$	788
Assumed incurred loss and loss expenses	16			15
Ceded incurred loss and loss expenses	(6		)	(15		)
Incurred loss and loss expenses	$	791		$	788

Earned Life Insurance Premiums On Ceded Business

(Dollars in millions)	Three months ended March 31,
	2018			2017
Direct earned premiums	$	77		$	74
Ceded earned premiums	(17		)	(17		)
Earned premiums	$	60		$	57

Life Insurance Contract Holders' Benefits Incurred On Ceded Business

(Dollars in millions)	Three months ended March 31,
	2018			2017
Direct contract holders' benefits incurred	$	76		$	76
Ceded contract holders' benefits incurred	(13		)	(11		)
Contract holders' benefits incurred	$	63		$	65

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Income Taxes (Tables)

3 Months Ended

Mar. 31, 2018

Income Tax Disclosure [Abstract]

Differences Between The 35 Percent Statutory Income Tax Rate And Effective Income Tax Rate

The differences between the 21 percent and 35 percent statutory federal income tax rates and our effective income tax rate were as follows:

(Dollars in millions)	Three months ended March 31,
	2018					2017
Tax at statutory rate:	$	(11	)	21.0	%	$	97		35.0	%
Increase (decrease) resulting from:
Tax-exempt income from municipal bonds	(5		)	10.0		(9		)	(3.3	)
Dividend received exclusion	(3		)	6.0		(8		)	(2.9	)
Other	—			1.0		(5		)	(1.6	)
Provision for income taxes	$	(19	)	38.0	%	$	75		27.2	%

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Net Income Per Common Share (Tables)

3 Months Ended

Mar. 31, 2018

Earnings Per Share [Abstract]

Calculations For Basic And Diluted Earnings Per Share

The table shows calculations for basic and diluted earnings per share:

(In millions, except per share data)	Three months ended March 31,
	2018			2017
Numerator:
Net income (loss)—basic and diluted	$	(31	)	$	201
Denominator:
Basic weighted-average common shares outstanding	164.0			164.6
Effect of share-based awards:
Stock options	—			1.1
Nonvested shares	—			0.8
Diluted weighted-average shares	164.0			166.5
Earnings per share:
Basic	$	(0.19	)	$	1.22
Diluted	(0.19		)	1.21
Number of anti-dilutive share-based awards	2.8			0.7

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Employee Retirement Benefits (Tables)

3 Months Ended

Mar. 31, 2018

Retirement Benefits [Abstract]

Schedule of Defined Benefit Plans Disclosures

The following summarizes the components of net periodic benefit cost for our qualified and supplemental pension plans:

(Dollars in millions)	Three months ended March 31,
	2018			2017
Service cost	$	3		$	3
Non-service costs (benefit):
Interest cost	3			3
Expected return on plan assets	(5		)	(5		)
Amortization of actuarial loss and prior service cost	—			1
Total non-service benefit	(2		)	(1		)
Net periodic benefit cost	$	1		$	2

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Segment Information (Tables)

3 Months Ended

Mar. 31, 2018

Segment Reporting [Abstract]

Segment Information

Segment information is summarized in the following table: 

(Dollars in millions)	Three months ended March 31,
	2018			2017
Revenues:
Commercial lines insurance
Commercial casualty	$	265		$	265
Commercial property	228			223
Commercial auto	161			155
Workers' compensation	80			84
Other commercial	56			54
Commercial lines insurance premiums	790			781
Fee revenues	2			1
Total commercial lines insurance	792			782
Personal lines insurance
Personal auto	151			141
Homeowner	136			125
Other personal	38			34
Personal lines insurance premiums	325			300
Fee revenues	1			2
Total personal lines insurance	326			302
Excess and surplus lines insurance	56			48
Life insurance premiums	60			57
Fee revenues	1			2
Total life insurance	61			59
Investments
Investment income, net of expenses	150			149
Investment gains and losses, net	(191		)	160
Total investment revenue	(41		)	309
Other
Cincinnati Re insurance premiums	29			22
Other	1			1
Total other revenues	30			23
Total revenues	$	1,224		$	1,523
Income (loss) before income taxes:
Insurance underwriting results
Commercial lines insurance	$	15		$	(2	)
Personal lines insurance	(9		)	(15		)
Excess and surplus lines insurance	18			18
Life insurance	2			—
Investments	(65		)	286
Other	(11		)	(11		)
Total income (loss) before income taxes	$	(50	)	$	276

Identifiable assets:	March 31, 2018		December 31, 2017
Property casualty insurance	$	2,888	$	2,863
Life insurance	1,418		1,409
Investments	16,748		17,112
Other	416		459
Total	$	21,470	$	21,843

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Accounting Policies (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Available-for-sale Equity Securities, Unrealized Gain, After Tax	$ 2,503	$ 0
Net investment loss	(191)	160
Equity securities
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net investment loss	(195)	149
Unrealized Gain (Loss) on Investments	$ (198)	$ 0

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Investments - Analysis of Cost or Amortized Cost, Gross Unrealized Gains and Losses and Fair Value for Investments (Detail) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Debt Securities
Schedule of Available-for-sale Securities [Line Items]
Cost or Amortized Cost	$ 10,364	$ 10,314
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	243	409
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	79	24
Fair Value	10,528	10,699
Debt Securities | Corporate
Schedule of Available-for-sale Securities [Line Items]
Cost or Amortized Cost	5,452	5,420
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	155	246
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	35	13
Fair Value	5,572	5,653
Debt Securities | States, municipalities and political subdivisions
Schedule of Available-for-sale Securities [Line Items]
Cost or Amortized Cost	4,304	4,316
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	85	155
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	35	6
Fair Value	4,354	4,465
Debt Securities | Commercial mortgage-backed
Schedule of Available-for-sale Securities [Line Items]
Cost or Amortized Cost	285	280
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	3	7
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	2	1
Fair Value	286	286
Debt Securities | Government-sponsored enterprises
Schedule of Available-for-sale Securities [Line Items]
Cost or Amortized Cost	277	257
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	0	1
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	6	4
Fair Value	271	254
Debt Securities | United States government
Schedule of Available-for-sale Securities [Line Items]
Cost or Amortized Cost	36	31
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	0	0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	1	0
Fair Value	35	31
Debt Securities | Foreign government
Schedule of Available-for-sale Securities [Line Items]
Cost or Amortized Cost	10	10
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	0	0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	0	0
Fair Value	$ 10	10
Equity securities
Schedule of Available-for-sale Securities [Line Items]
Cost or Amortized Cost		3,094
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax		3,169
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax		14
Fair Value		6,249
Equity securities | Common equities
Schedule of Available-for-sale Securities [Line Items]
Cost or Amortized Cost		2,918
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax		3,135
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax		14
Fair Value		6,039
Equity securities | Nonredeemable preferred equities
Schedule of Available-for-sale Securities [Line Items]
Cost or Amortized Cost		176
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax		34
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax		0
Fair Value		210
Fixed Maturities And Equity Securities
Schedule of Available-for-sale Securities [Line Items]
Cost or Amortized Cost		13,408
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax		3,578
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax		38
Fair Value		$ 16,948

XML

Investments - Fair Values and Unrealized Losses by Investment Category and by Duration of Securities' Continuous Unrealized Loss Position (Detail) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Investments, Unrealized Loss Position [Line Items]
Less than 12 months Fair Value		$ 809
Less than 12 months Unrealized Losses		20
12 months or more Fair Value		682
12 months or more Unrealized Losses		18
Total Fair Value		1,491
Total Unrealized Losses		38
Fixed maturities
Investments, Unrealized Loss Position [Line Items]
Less than 12 months Fair Value	$ 2,300	580
Less than 12 months Unrealized Losses	45	6
12 months or more Fair Value	678	682
12 months or more Unrealized Losses	34	18
Total Fair Value	2,978	1,262
Total Unrealized Losses	79	24
Fixed maturities | Corporate
Investments, Unrealized Loss Position [Line Items]
Less than 12 months Fair Value	1,002	330
Less than 12 months Unrealized Losses	20	4
12 months or more Fair Value	253	252
12 months or more Unrealized Losses	15	9
Total Fair Value	1,255	582
Total Unrealized Losses	35	13
Fixed maturities | States, municipalities and political subdivisions
Investments, Unrealized Loss Position [Line Items]
Less than 12 months Fair Value	1,052	88
Less than 12 months Unrealized Losses	21	1
12 months or more Fair Value	256	264
12 months or more Unrealized Losses	14	5
Total Fair Value	1,308	352
Total Unrealized Losses	35	6
Fixed maturities | Commercial mortgage-backed
Investments, Unrealized Loss Position [Line Items]
Less than 12 months Fair Value	81	33
Less than 12 months Unrealized Losses	1	0
12 months or more Fair Value	35	36
12 months or more Unrealized Losses	1	1
Total Fair Value	116	69
Total Unrealized Losses	2	1
Fixed maturities | Government-sponsored enterprises
Investments, Unrealized Loss Position [Line Items]
Less than 12 months Fair Value	131	96
Less than 12 months Unrealized Losses	2	1
12 months or more Fair Value	123	124
12 months or more Unrealized Losses	4	3
Total Fair Value	254	220
Total Unrealized Losses	6	4
Fixed maturities | Foreign government
Investments, Unrealized Loss Position [Line Items]
Less than 12 months Fair Value	10	10
Less than 12 months Unrealized Losses	0	0
12 months or more Fair Value	0	0
12 months or more Unrealized Losses	0	0
Total Fair Value	10	10
Total Unrealized Losses	0	0
Fixed maturities | United States government
Investments, Unrealized Loss Position [Line Items]
Less than 12 months Fair Value	24	23
Less than 12 months Unrealized Losses	1	0
12 months or more Fair Value	11	6
12 months or more Unrealized Losses	0	0
Total Fair Value	35	29
Total Unrealized Losses	$ 1	0
Equity securities
Investments, Unrealized Loss Position [Line Items]
Less than 12 months Fair Value		229
Less than 12 months Unrealized Losses		14
12 months or more Fair Value		0
12 months or more Unrealized Losses		0
Total Fair Value		229
Total Unrealized Losses		14
Equity securities | Common equities
Investments, Unrealized Loss Position [Line Items]
Less than 12 months Fair Value		229
Less than 12 months Unrealized Losses		14
12 months or more Fair Value		0
12 months or more Unrealized Losses		0
Total Fair Value		229
Total Unrealized Losses		$ 14

XML

Investments - Schedule of Contractual Maturities of Investments (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Amortized cost
Due in one year or less	$ 449
Due after one year through five years	2,714
Due after five years through ten years	3,986
Due after ten years	3,215
Total	10,364	$ 10,314
Fair value
Due in one year or less	457
Due after one year through five years	2,768
Due after five years through ten years	4,046
Due after ten years	3,257
Total	$ 10,528	$ 10,699
% of fair value
Due in one year or less	4.40%
Due after one year through five years	26.30%
Due after five years through ten years	38.40%
Due after ten years	30.90%
Total	100.00%

XML

Investments - Realized Investment Gains and Losses and Change in Unrealized Investment Gains and Losses and Other Items (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Investment income:
Interest	$ 110	$ 111
Dividends	42	39
Other	1	1
Total	153	151
Less investment expenses	3	2
Total	150	149
Investment gains and losses, net:
Investment gains and losses, net	(191)	160
Fixed maturities
Investment gains and losses, net:
Gross realized gains	4	10
Gross realized losses	0	0
Investment gains and losses, net	4	10
Equity securities
Investment income:
Gain (Loss) on Sale of Investments	3	0
Unrealized Gain (Loss) on Investments	(198)	0
Investment gains and losses, net:
Gross realized gains	0	153
Gross realized losses	0	(4)
Other	0	1
Investment gains and losses, net	$ (195)	$ 149

XML

Investments - Additional Information (Detail)	3 Months Ended		12 Months Ended
	Mar. 31, 2018 USD ($) security	Mar. 31, 2017 USD ($) security	Dec. 31, 2017 USD ($) security
Gain (Loss) on Investments [Line Items]
Largest Single Common Stock Holding	$ 248,000,000
Largest equity holdings to total equity portfolio	4.20%
Largest equity holdings to total portfolio	1.50%
Unrealized losses 12 months or more (equity investment less than $500,000)			$ (18,000,000)
Fixed maturity investments, Percentage of amortized costs	70.00%		70.00%
Fixed maturities
Gain (Loss) on Investments [Line Items]
Number Of Securities Other Than Temporary Impairment Losses1 | security	0	0
Provision for Other Credit Losses	$ 0	$ 0
Number Of Securities Continuous Unrealized Loss Position More Than Twelve Months | security	250		249
Unrealized losses 12 months or more (equity investment less than $500,000)	$ (34,000,000)		$ (18,000,000)
Number Of Securities Continuous Unrealized Loss Position More Than Twelve Months and Below 70 Percent of Amortized Cost	1		0
Equity securities
Gain (Loss) on Investments [Line Items]
Number Of Securities Other Than Temporary Impairment Losses1 | security		0
Number Of Securities Continuous Unrealized Loss Position More Than Twelve Months			0
Unrealized losses 12 months or more (equity investment less than $500,000)			$ 0

XML

Fair Value Measurements - Fair Value Hierarchy for Assets Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities, at fair value	$ 10,528	$ 10,699
Equity securities, at fair value	6,086	6,249
Separate accounts	803	806
Top Hat savings plan mutual funds and common equity (included in Other assets)	34	31
Fair value of asset	17,441	17,774
Debt Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities, at fair value	10,528	10,699
Debt Securities | Corporate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities, at fair value	5,572	5,653
Debt Securities | States, municipalities and political subdivisions
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities, at fair value	4,354	4,465
Debt Securities | Commercial mortgage-backed
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities, at fair value	286	286
Debt Securities | Government-sponsored enterprises
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities, at fair value	271	254
Debt Securities | United States government
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities, at fair value	35	31
Debt Securities | Foreign government
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities, at fair value	10	10
Equity securities | Common equities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities, at fair value	5,893	6,039
Equity securities | Nonredeemable preferred equities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities, at fair value	193	210
Taxable Fixed Maturities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Separate accounts	793	795
Quoted prices in active markets for identical assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Top Hat savings plan mutual funds and common equity (included in Other assets)	34	31
Fair value of asset	5,962	6,101
Quoted prices in active markets for identical assets (Level 1) | Debt Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities, at fair value	35	31
Quoted prices in active markets for identical assets (Level 1) | Debt Securities | Corporate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities, at fair value	0	0
Quoted prices in active markets for identical assets (Level 1) | Debt Securities | States, municipalities and political subdivisions
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities, at fair value	0	0
Quoted prices in active markets for identical assets (Level 1) | Debt Securities | Commercial mortgage-backed
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities, at fair value	0	0
Quoted prices in active markets for identical assets (Level 1) | Debt Securities | Government-sponsored enterprises
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities, at fair value	0	0
Quoted prices in active markets for identical assets (Level 1) | Debt Securities | United States government
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities, at fair value	35	31
Quoted prices in active markets for identical assets (Level 1) | Debt Securities | Foreign government
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities, at fair value	0	0
Quoted prices in active markets for identical assets (Level 1) | Equity securities | Common equities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities, at fair value	5,893	6,039
Quoted prices in active markets for identical assets (Level 1) | Equity securities | Nonredeemable preferred equities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities, at fair value	0	0
Quoted prices in active markets for identical assets (Level 1) | Taxable Fixed Maturities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Separate accounts	0	0
Significant other observable inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Top Hat savings plan mutual funds and common equity (included in Other assets)	0	0
Fair value of asset	11,474	11,667
Significant other observable inputs (Level 2) | Debt Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities, at fair value	10,488	10,662
Significant other observable inputs (Level 2) | Debt Securities | Corporate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities, at fair value	5,571	5,652
Significant other observable inputs (Level 2) | Debt Securities | States, municipalities and political subdivisions
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities, at fair value	4,350	4,460
Significant other observable inputs (Level 2) | Debt Securities | Commercial mortgage-backed
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities, at fair value	286	286
Significant other observable inputs (Level 2) | Debt Securities | Government-sponsored enterprises
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities, at fair value	271	254
Significant other observable inputs (Level 2) | Debt Securities | United States government
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities, at fair value	0	0
Significant other observable inputs (Level 2) | Debt Securities | Foreign government
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities, at fair value	10	10
Significant other observable inputs (Level 2) | Equity securities | Common equities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities, at fair value	0	0
Significant other observable inputs (Level 2) | Equity securities | Nonredeemable preferred equities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities, at fair value	193	210
Significant other observable inputs (Level 2) | Taxable Fixed Maturities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Separate accounts	793	795
Significant unobservable inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Top Hat savings plan mutual funds and common equity (included in Other assets)	0	0
Fair value of asset	5	6
Significant unobservable inputs (Level 3) | Debt Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities, at fair value	5	6
Significant unobservable inputs (Level 3) | Debt Securities | Corporate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities, at fair value	1	1
Significant unobservable inputs (Level 3) | Debt Securities | States, municipalities and political subdivisions
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities, at fair value	4	5
Significant unobservable inputs (Level 3) | Debt Securities | Commercial mortgage-backed
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities, at fair value	0	0
Significant unobservable inputs (Level 3) | Debt Securities | Government-sponsored enterprises
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities, at fair value	0	0
Significant unobservable inputs (Level 3) | Debt Securities | United States government
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities, at fair value	0	0
Significant unobservable inputs (Level 3) | Debt Securities | Foreign government
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities, at fair value	0	0
Significant unobservable inputs (Level 3) | Equity securities | Common equities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities, at fair value	0	0
Significant unobservable inputs (Level 3) | Equity securities | Nonredeemable preferred equities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities, at fair value	0	0
Significant unobservable inputs (Level 3) | Taxable Fixed Maturities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Separate accounts	$ 0	$ 0

XML

Fair Value Measurements - Change in Level 3 Assets (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 6	$ 78
Total gains or losses (realized/unrealized):
Included in net income	0	0
Included in other comprehensive income	(1)	0
Purchases	0	0
Sales	0	0
Transfers into Level 3	0	0
Transfers out of Level 3	0	(77)
Ending balance	5	1
Corporate Fixed Maturities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	1	78
Total gains or losses (realized/unrealized):
Included in net income	0	0
Included in other comprehensive income	0	0
Purchases	0	0
Sales	0	0
Transfers into Level 3	0	0
Transfers out of Level 3	0	(77)
Ending balance	1	1
States, Municipalities And Political Subdivisions Fixed Maturities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	5	0
Total gains or losses (realized/unrealized):
Included in net income	0	0
Included in other comprehensive income	(1)	0
Purchases	0	0
Sales	0	0
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Ending balance	$ 4	$ 0

XML

Fair Value Measurements - Summary of Book Value and Principal Amounts of Long-Term Debt (Detail) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Book value	$ 787	$ 787
Principal amount of debt	$ 793	$ 793
Senior Debentures 6.900% Due 2028
Debt Instrument [Line Items]
Interest rate	6.90%	6.90%
Debt issuance year	1998	1998
Book value	$ 26	$ 26
Principal amount of debt	$ 28	$ 28
Senior Debentures 6.920% Due 2028
Debt Instrument [Line Items]
Interest rate	6.92%	6.92%
Debt issuance year	2005	2005
Book value	$ 391	$ 391
Principal amount of debt	$ 391	$ 391
Senior Notes 6.125% Due 2034
Debt Instrument [Line Items]
Interest rate	6.125%	6.125%
Debt issuance year	2004	2004
Book value	$ 370	$ 370
Principal amount of debt	$ 374	$ 374

XML

Fair Value Measurements - Fair Values of Note Payable and Long-Term Debt (Detail) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of note payable	$ 24	$ 24
Total	1,011	1,040
Finance receivable	$ 61	$ 61
Senior Debentures 6.900 % Due 2028
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate	6.90%	6.90%
Debt instrument, year of maturity	2028	2028
Fair value of senior debt	$ 33	$ 34
Senior Debentures 6.920 % Due 2028
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate	6.92%	6.92%
Debt instrument, year of maturity	2028	2028
Fair value of senior debt	$ 490	$ 505
Senior Notes 6.125 % Due 2034
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate	6.125%	6.125%
Debt instrument, year of maturity	2034	2034
Fair value of senior debt	$ 464	$ 477
Quoted prices in active markets for identical assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of note payable	0	0
Total	0	0
Quoted prices in active markets for identical assets (Level 1) | Senior Debentures 6.900 % Due 2028
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of senior debt	0	0
Quoted prices in active markets for identical assets (Level 1) | Senior Debentures 6.920 % Due 2028
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of senior debt	0	0
Quoted prices in active markets for identical assets (Level 1) | Senior Notes 6.125 % Due 2034
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of senior debt	0	0
Significant other observable inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of note payable	24	24
Total	1,011	1,040
Significant other observable inputs (Level 2) | Senior Debentures 6.900 % Due 2028
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of senior debt	33	34
Significant other observable inputs (Level 2) | Senior Debentures 6.920 % Due 2028
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of senior debt	490	505
Significant other observable inputs (Level 2) | Senior Notes 6.125 % Due 2034
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of senior debt	464	477
Significant unobservable inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of note payable	0	0
Total	0	0
Significant unobservable inputs (Level 3) | Senior Debentures 6.900 % Due 2028
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of senior debt	0	0
Significant unobservable inputs (Level 3) | Senior Debentures 6.920 % Due 2028
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of senior debt	0	0
Significant unobservable inputs (Level 3) | Senior Notes 6.125 % Due 2034
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of senior debt	0	0
Deferred Annuities And Structured Settlements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loss and loss expense reserves	821	835
Policy Loans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Finance receivable	$ 31	$ 31

XML

Fair Value Measurements - Fair Value of Life Policy Loans (Detail) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Finance receivable	$ 61	$ 61
Fair value of life policy loans	40	41
Quoted prices in active markets for identical assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of life policy loans	0	0
Significant other observable inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of life policy loans	0	0
Significant unobservable inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of life policy loans	40	41
Policy Loans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Finance receivable	$ 31	$ 31

XML

Fair Value Measurements - Fair Values of Deferred Annuities, Structured Settlements and Other Items (Detail) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value of life insurance liabilities	$ 988	$ 1,044
Deferred annuities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value of life insurance liabilities	788	834
Structured Settlements
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value of life insurance liabilities	200	210
Quoted prices in active markets for identical assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value of life insurance liabilities	0	0
Quoted prices in active markets for identical assets (Level 1) | Deferred annuities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value of life insurance liabilities	0	0
Quoted prices in active markets for identical assets (Level 1) | Structured Settlements
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value of life insurance liabilities	0	0
Significant other observable inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value of life insurance liabilities	200	210
Significant other observable inputs (Level 2) | Deferred annuities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value of life insurance liabilities	0	0
Significant other observable inputs (Level 2) | Structured Settlements
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value of life insurance liabilities	200	210
Significant unobservable inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value of life insurance liabilities	788	834
Significant unobservable inputs (Level 3) | Deferred annuities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value of life insurance liabilities	788	834
Significant unobservable inputs (Level 3) | Structured Settlements
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value of life insurance liabilities	$ 0	$ 0

XML

Fair Value Measurements - Additional Information (Detail) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Finance receivable	$ 61	$ 61
Loss and loss expense reserves	5,345	5,273
Life Policy Loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Finance receivable	31	31
Deferred Annuities And Structured Settlements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loss and loss expense reserves	821	835
Loss and loss expense reserves	$ 161	$ 161
Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Percentage Of Level 3 Assets To Total Financial Instruments Measured At Fair Value	1.00%

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Property Casualty Loss and Loss Expenses - Consolidated Property Casualty Loss and Loss Expense Reserves (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Summary of Consolidated Property Casualty Loss and Loss Expense Reserves [Roll Forward]
Gross loss and loss expense reserves, beginning of period	$ 5,219	$ 5,035
Less reinsurance recoverable	187	298
Net loss and loss expense reserves, beginning of period	5,032	4,737
Current accident year	839	826
Prior accident years	(48)	(38)
Total incurred	791	788
Current accident year	195	185
Prior accident years	519	509
Total paid	714	694
Net loss and loss expense reserves, end of period	5,109	4,831
Plus reinsurance recoverable	184	297
Gross loss and loss expense reserves, end of period	$ 5,293	$ 5,128

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Property Casualty Loss and Loss Expenses - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017	Dec. 31, 2016
Supplemental Information for Property, Casualty Insurance Underwriters [Line Items]
Reserve for loss and loss expenses	$ 5,293	$ 5,128	$ 5,219	$ 5,035
Prior accident years	(48)	(38)
Life and Health Loss Reserves
Supplemental Information for Property, Casualty Insurance Underwriters [Line Items]
Reserve for loss and loss expenses	52	49
Commercial Lines
Supplemental Information for Property, Casualty Insurance Underwriters [Line Items]
Prior accident years	(35)	(11)
Commercial Lines | Workers' Compensation
Supplemental Information for Property, Casualty Insurance Underwriters [Line Items]
Prior accident years	(13)	(18)
Commercial Lines | Commercial Casualty Segment [Member]
Supplemental Information for Property, Casualty Insurance Underwriters [Line Items]
Prior accident years	5	15
Commercial Lines | Other Commercial Lines [Member]
Supplemental Information for Property, Casualty Insurance Underwriters [Line Items]
Prior accident years	(4)	(8)
Commercial Lines | Commercial Auto
Supplemental Information for Property, Casualty Insurance Underwriters [Line Items]
Prior accident years	(2)	10
Commercial Lines | Commercial Property Segment [Member]
Supplemental Information for Property, Casualty Insurance Underwriters [Line Items]
Prior accident years	(21)	(10)
Personal Lines
Supplemental Information for Property, Casualty Insurance Underwriters [Line Items]
Prior accident years	(1)	(10)
Excess and Surplus Lines Insurance
Supplemental Information for Property, Casualty Insurance Underwriters [Line Items]
Prior accident years	(10)	(13)
Reinsurance assumed and other non segment [Member]
Supplemental Information for Property, Casualty Insurance Underwriters [Line Items]
Prior accident years	(2)	(4)
Consolidated Property and Casualty Insurance Entity | Catastrophe Development
Supplemental Information for Property, Casualty Insurance Underwriters [Line Items]
Prior accident years	$ (7)	$ (11)

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Reserves in Addition to Account Balance, Based on Expected No-Lapse Guarantee Benefits and Expected Policy Assessments (Detail) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Liability for Future Policy Benefit, by Product Segment [Line Items]
Life policy and investment contract reserves	$ 2,740	$ 2,729
Life policy reserves:
Liability for Future Policy Benefit, by Product Segment [Line Items]
Life policy and investment contract reserves	1,145	1,127
Life policy reserves: | Ordinary/traditional life
Liability for Future Policy Benefit, by Product Segment [Line Items]
Life policy and investment contract reserves	1,098	1,080
Life policy reserves: | Other
Liability for Future Policy Benefit, by Product Segment [Line Items]
Life policy and investment contract reserves	47	47
Investment contract reserves:
Liability for Future Policy Benefit, by Product Segment [Line Items]
Life policy and investment contract reserves	1,595	1,602
Investment contract reserves: | Deferred annuities
Liability for Future Policy Benefit, by Product Segment [Line Items]
Life policy and investment contract reserves	821	835
Investment contract reserves: | Universal life
Liability for Future Policy Benefit, by Product Segment [Line Items]
Life policy and investment contract reserves	607	601
Investment contract reserves: | Structured Settlement Annuity [Member]
Liability for Future Policy Benefit, by Product Segment [Line Items]
Life policy and investment contract reserves	161	160
Investment contract reserves: | Other
Liability for Future Policy Benefit, by Product Segment [Line Items]
Life policy and investment contract reserves	$ 6	$ 6

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Deferred Acquisition Costs - Deferred Policy Acquisition Costs and Asset Reconciliation (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Deferred policy acquisition costs asset, beginning of period	$ 670	$ 637
Capitalized deferred policy acquisition costs	245	239
Deferred Policy Acquisition Costs, Amortization Expense	(234)	(214)
Deferred Policy Acquisition Cost, Amortization Expense, Other	10	(2)
Deferred policy acquisition costs asset, end of period	691	660
Life Insurance Product Line [Member]
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Deferred policy acquisition costs asset, beginning of period	232	229
Capitalized deferred policy acquisition costs	13	13
Deferred Policy Acquisition Costs, Amortization Expense	(10)	(8)
Deferred Policy Acquisition Cost, Amortization Expense, Other	10	(2)
Deferred policy acquisition costs asset, end of period	245	232
Consolidated Property and Casualty Insurance Entity
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Deferred policy acquisition costs asset, beginning of period	438	408
Capitalized deferred policy acquisition costs	232	226
Deferred Policy Acquisition Costs, Amortization Expense	(224)	(206)
Deferred policy acquisition costs asset, end of period	$ 446	$ 428

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Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss), Tax [Abstract]
Unrealized gains reclassified to retained earnings for ASU 2016-01, after tax			$ 2,503		$ 0
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Accumulated other comprehensive income, net of tax, beginning of period	$ 115		115	$ 2,788
Accumulated other comprehensive income, net of tax, end of period	115
Accumulated Net Unrealized Investment Gain (Loss)
Accumulated Other Comprehensive Income Loss Before Tax [Abstract]
Accumulated other comprehensive income, before tax, beginning of period	385	$ 2,625
Cumulative effect of change in accounting for equity securities, before tax				(3,155)		$ 0
Other comprehensive income before reclassification, before tax	(217)	290
Reclassification adjustment, before tax	(4)	(159)
Effect on other comprehensive income, before tax	(221)	131
Accumulated other comprehensive income, before tax, end of period	164	2,756
Accumulated Other Comprehensive Income (Loss), Tax [Abstract]
Accumulated other comprehensive income, tax, beginning of period	81	908
Cumulative effect of change in accounting for equity securities, tax				(652)		0
Other comprehensive income before reclassification, tax	(45)	102
Reclassification adjustment, tax	(1)	(56)
Effect on other comprehensive income, tax	(46)	46
Accumulated other comprehensive income, tax, end of period	35	954
Unrealized gains reclassified to retained earnings for ASU 2016-01, after tax				(2,503)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Accumulated other comprehensive income, net of tax, beginning of period	129	1,802	129	304	1,802	1,717
Cumulative effect of change in accounting for equity securities, net						0
Other comprehensive income before reclassification, net of tax	(172)	188
Reclassification adjustment, net of tax	(3)	(103)
Effect on other comprehensive income, net of tax	(175)	85
Accumulated other comprehensive income, net of tax, end of period	129	1,802
Accumulated Defined Benefit Plans Adjustment
Accumulated Other Comprehensive Income Loss Before Tax [Abstract]
Accumulated other comprehensive income, before tax, beginning of period	(12)	(26)
Other comprehensive income before reclassification, before tax	0	0
Reclassification adjustment, before tax	0	1
Effect on other comprehensive income, before tax	0	1
Accumulated other comprehensive income, before tax, end of period	(12)	(25)
Accumulated Other Comprehensive Income (Loss), Tax [Abstract]
Accumulated other comprehensive income, tax, beginning of period	(1)	(8)
Other comprehensive income before reclassification, tax	0	0
Reclassification adjustment, tax	0	0
Effect on other comprehensive income, tax	0	0
Accumulated other comprehensive income, tax, end of period	(1)	(8)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Accumulated other comprehensive income, net of tax, beginning of period	(11)	(17)	(11)	(11)	(17)	(18)
Other comprehensive income before reclassification, net of tax	0	0
Reclassification adjustment, net of tax	0	1
Effect on other comprehensive income, net of tax	0	1
Accumulated other comprehensive income, net of tax, end of period	(11)	(17)
Accumulated Net Unrealized Gain (Loss) on Deferred Costs, Reserves And Other
Accumulated Other Comprehensive Income Loss Before Tax [Abstract]
Accumulated other comprehensive income, before tax, beginning of period	(10)	(9)
Other comprehensive income before reclassification, before tax	6	3
Reclassification adjustment, before tax	0	(1)
Effect on other comprehensive income, before tax	6	2
Accumulated other comprehensive income, before tax, end of period	(4)	(7)
Accumulated Other Comprehensive Income (Loss), Tax [Abstract]
Accumulated other comprehensive income, tax, beginning of period	(2)	(3)
Other comprehensive income before reclassification, tax	1	2
Reclassification adjustment, tax	0	(1)
Effect on other comprehensive income, tax	1	1
Accumulated other comprehensive income, tax, end of period	(1)	(2)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Accumulated other comprehensive income, net of tax, beginning of period	(3)	(5)	(3)	(8)	(5)	(6)
Other comprehensive income before reclassification, net of tax	5	1
Reclassification adjustment, net of tax	0	0
Effect on other comprehensive income, net of tax	5	1
Accumulated other comprehensive income, net of tax, end of period	(3)	(5)
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income Loss Before Tax [Abstract]
Accumulated other comprehensive income, before tax, beginning of period	363	2,590
Cumulative effect of change in accounting for equity securities, before tax				(3,155)		0
Change in unrealized gains, net, on investments available for sale, before tax	(221)	131
Change in pension obligations, before tax	0	1
Change in life deferred acquisition costs, life policy reserves and other, before tax	6	2
Effect on other comprehensive income, before tax	(215)	134
Accumulated other comprehensive income, before tax, end of period	148	2,724
Accumulated Other Comprehensive Income (Loss), Tax [Abstract]
Accumulated other comprehensive income, tax, beginning of period	78	897
Cumulative effect of change in accounting for equity securities, tax				(652)		0
Change in unrealized gains, net, on investments available for sale, tax	(46)	46
Change in pension obligations, tax	0	0
Change in life deferred acquisition costs, life policy reserves and other, tax	1	1
Effect on other comprehensive income, tax	(45)	47
Accumulated other comprehensive income, tax, end of period	33	944
Unrealized gains reclassified to retained earnings for ASU 2016-01, after tax			(2,503)	(2,503)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Accumulated other comprehensive income, net of tax, beginning of period	115	1,780	$ 115	285	$ 1,780	1,693
Cumulative effect of change in accounting for equity securities, net						0
Change in unrealized gains, net, on investments available for sale, net of tax	(175)	85
Change in pension obligations, net of tax	0	1
Change in life deferred acquisition costs, life policy reserves and other, net of tax	5	1
Effect on other comprehensive income, net of tax	(170)	87
Accumulated other comprehensive income, net of tax, end of period	115	1,780
Previously Reported | Accumulated Net Unrealized Investment Gain (Loss)
Accumulated Other Comprehensive Income Loss Before Tax [Abstract]
Accumulated other comprehensive income, before tax, beginning of period	3,540	2,625
Accumulated Other Comprehensive Income (Loss), Tax [Abstract]
Accumulated other comprehensive income, tax, beginning of period	733	908
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Accumulated other comprehensive income, net of tax, beginning of period				2,807		1,717
Previously Reported | Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income Loss Before Tax [Abstract]
Accumulated other comprehensive income, before tax, beginning of period	3,518	2,590
Accumulated Other Comprehensive Income (Loss), Tax [Abstract]
Accumulated other comprehensive income, tax, beginning of period	$ 730	$ 897
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Accumulated other comprehensive income, net of tax, beginning of period				$ 2,788		$ 1,693

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Reinsurance - Written Consolidated Property Casualty Insurance Premium on Assumed and Ceded Business (Details) - Consolidated Property and Casualty Insurance Entity - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Property Casualty Insurance Premiums Written On Assumed And Ceded Business [Line Items]
Direct written premiums	$ 1,247	$ 1,226
Assumed written premiums	49	33
Ceded written premiums	(38)	(28)
Net written premiums	$ 1,258	$ 1,231

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Reinsurance - Earned Consolidated Property Casualty Insurance Premiums on Assumed and Ceded Business (Detail) - Consolidated Property and Casualty Insurance Entity - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Direct earned premiums	$ 1,207	$ 1,163
Assumed earned premiums	33	27
Ceded earned premiums	(40)	(39)
Earned premiums	$ 1,200	$ 1,151

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Reinsurance - Incurred Consolidated Property Casualty Insurance Loss and Loss Expenses on Assumed and Ceded Business (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Incurred loss and loss expenses	$ 854	$ 853
Consolidated Property and Casualty Insurance Entity
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Direct incurred loss and loss expenses	781	788
Assumed incurred loss and loss expenses	16	15
Ceded incurred loss and loss expenses	(6)	(15)
Incurred loss and loss expenses	$ 791	$ 788

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Reinsurance - Earned Life Insurance Premiums on Ceded Business (Detail) - Life Insurance Segment - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Direct earned premiums	$ 77	$ 74
Ceded earned premiums	(17)	(17)
Earned premiums	$ 60	$ 57

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Reinsurance - Life Insurance Contract Holders' Benefits Incurred on Ceded Business (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Insurance losses and contract holders' benefits	$ 854	$ 853
Life Insurance Segment
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Direct contract holders' benefits incurred	76	76
Ceded contract holders' benefits incurred	(13)	(11)
Insurance losses and contract holders' benefits	$ 63	$ 65

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Income Taxes - Differences Between Statutory Income Tax Rate and Effective Income Tax Rate (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Income Tax Disclosure [Abstract]
Tax at statutory rate	$ (11)	$ 97
Increase (decrease) resulting from:
Tax-exempt income from municipal bonds	(5)	(9)
Dividend received exclusion	(3)	(8)
Other	0	(5)
Total provision (benefit) for income taxes	$ (19)	$ 75
Tax at statutory rate	21.00%	35.00%
Increase (decrease) resulting from:
Tax-exempt income from municipal bonds	10.00%	(3.30%)
Dividend received exclusion	6.00%	(2.90%)
Other	1.00%	(1.60%)
Provision for income taxes	38.00%	27.20%

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Income Taxes (Narrative) (Details)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Income Tax Disclosure [Abstract]
Tax at statutory rate, percentage	21.00%	35.00%

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Net Income Per Common Share - Calculations for Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Numerator:
Net income (loss)—basic and diluted	$ (31)	$ 201
Denominator:
Basic weighted-average common shares outstanding (in shares)	164.0	164.6
Diluted weighted-average shares	164.0	166.5
Earnings per share:
Basic (in USD per share)	$ (0.19)	$ 1.22
Diluted (in USD per share)	$ (0.19)	$ 1.21
Number of anti-dilutive stock-based awards (in shares)	2.8	0.7
Stock Options
Denominator:
Effect of stock-based awards (in shares)	0.0	1.1
Nonvested shares
Denominator:
Effect of stock-based awards (in shares)	0.0	0.8

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Employee Retirement Benefits - Components of Net Periodic Costs for Qualified and Supplemental Pension Plans (Detail) - Qualified Pension Plans [Member] - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 3	$ 3
Interest cost	3	3
Expected return on plan assets	(5)	(5)
Amortization of actuarial loss and prior service cost	0	1
Net periodic benefit cost	$ 1	$ 2

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Employee Retirement Benefits - Defined Contribution Plan (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Matching contributions to 401(k) and Top Hat plans	$ 6	$ 6
Qualified Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension contributions	$ 5

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Segment Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Segment Reporting Information [Line Items]
Earned premiums	$ 1,260	$ 1,208
Fee revenues	4	5
Investment income, net of expenses	150	149
Investment gains and losses, net	(191)	160
Other	1	1
Total revenues	1,224	1,523
Income (loss) before income taxes	(50)	276
Identifiable assets	21,470		$ 21,843
Consolidated Property and Casualty Insurance Entity
Segment Reporting Information [Line Items]
Identifiable assets	2,888		2,863
Life Insurance Segment
Segment Reporting Information [Line Items]
Identifiable assets	1,418		1,409
Investments Segment
Segment Reporting Information [Line Items]
Identifiable assets	16,748		17,112
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Other	1	1
Total revenues	30	23
Income (loss) before income taxes	(11)	(11)
Identifiable assets	416		$ 459
Corporate, Non-Segment [Member] | Reinsurance assumed and other non segment [Member]
Segment Reporting Information [Line Items]
Earned premiums	29	22
Operating Segments | Commercial Lines
Segment Reporting Information [Line Items]
Earned premiums	790	781
Fee revenues	2	1
Total revenues	792	782
Income (loss) before income taxes	15	(2)
Operating Segments | Personal Lines
Segment Reporting Information [Line Items]
Earned premiums	325	300
Fee revenues	1	2
Total revenues	326	302
Income (loss) before income taxes	(9)	(15)
Operating Segments | Excess and Surplus Lines Insurance
Segment Reporting Information [Line Items]
Earned premiums	56	48
Income (loss) before income taxes	18	18
Operating Segments | Life Insurance Segment
Segment Reporting Information [Line Items]
Earned premiums	60	57
Fee revenues	1	2
Total revenues	61	59
Income (loss) before income taxes	2	0
Operating Segments | Investments Segment
Segment Reporting Information [Line Items]
Investment income, net of expenses	150	149
Investment gains and losses, net	(191)	160
Total revenues	(41)	309
Income (loss) before income taxes	(65)	286
Commercial Casualty | Operating Segments | Commercial Lines
Segment Reporting Information [Line Items]
Earned premiums	265	265
Commercial Property | Operating Segments | Commercial Lines
Segment Reporting Information [Line Items]
Earned premiums	228	223
Commercial Auto | Operating Segments | Commercial Lines
Segment Reporting Information [Line Items]
Earned premiums	161	155
Workers' Compensation | Operating Segments | Commercial Lines
Segment Reporting Information [Line Items]
Earned premiums	80	84
Other Commercial Lines | Operating Segments | Commercial Lines
Segment Reporting Information [Line Items]
Earned premiums	56	54
Personal Auto | Operating Segments | Personal Lines
Segment Reporting Information [Line Items]
Earned premiums	151	141
Home Owner Segment | Operating Segments | Personal Lines
Segment Reporting Information [Line Items]
Earned premiums	136	125
Other Personal Lines | Operating Segments | Personal Lines
Segment Reporting Information [Line Items]
Earned premiums	$ 38	$ 34

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Segment Information - Narrative (Details)	3 Months Ended
	Mar. 31, 2018 segment industry
Segment Reporting [Abstract]
Number of Industries Operating In | industry	2
Number of Reportable Segments | segment	5